Contents

• EDCS Unit Dictionary
• EDCS Scale Dictionary
• EDCS Unit Equivalence Class Dictionary

EDCS Unit Dictionary

EDCS Unit Symbolic Constant: EUC_AMP_PER_METRE

EDCS Unit Code: 1

Symbol: A/m

Number of quantities which this unit of measure may represent:: 3

• Quantity: lineic electric current (linear electric current density)
  Definition: The electric current in a conducting sheet divided by the width of the sheet.
  Reference: [I31-5, 5-16.a]
  


• Quantity: magnetic field strength
  Definition: A vector quantity, the rotation (curl) of which is equal to the sum of the electric current density and the time derivative of the electric flux density.
  Reference: [I31-5, 5-17.a]
  


• Quantity: magnetization
  Definition: The extent to which a magnetic material is magnetized, given by the magnetic moment per unit volume.
  Reference: [I31-5, 5-28.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_AMP_PER_SQ_M_KELVIN_SQD

EDCS Unit Code: 2

Symbol: A/(m² · K²)

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermionic emission current density
  Definition: A vector quantity, the integral of whose normal component over a heated surface is equal to the net number of particles (electrons or ions) emitted from that surface, as a function of the thermodynamic temperature of that surface.
  Reference: [I31-13, 13-27.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_AMP_PER_SQ_METRE

EDCS Unit Code: 3

Symbol: A/m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: areic electric current (electric current density)
  Definition: A vector quantity, the integral of whose normal component over a given surface is equal to the electric current flowing through that surface.
  Reference: [I31-5, 5-15.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_AMPERE

EDCS Unit Code: 4

Symbol: A

Number of quantities which this unit of measure may represent:: 4

• Quantity: magnetomotive force
  Definition: The work required to carry a magnetic pole of unit strength once around a magnetic circuit.
  Reference: [I31-5, 5-18.a]
  


• Quantity: magnetic potential difference
  Definition: On a given path, the magnetic potential difference between point 1 and point 2 is the line integral from 1 to 2 of the magnetic field strength along that path.
  Reference: [I31-5, 5-18.a]
  


• Quantity: electric current
  Definition: That constant electric current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10^-7 newton per metre of length.SI base unit.
  Reference: [I31-0, Table 1],[I31--5, 5-1.a]
  


• Quantity: current linkage
  Definition: The net electric conduction current through a closed loop.
  Reference: [I31-5, 5-18.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_ANGSTROM

EDCS Unit Code: 5

Symbol: Å

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: ångström; 1 Å = 10^-10 m = 10^-1 nm = 10^-4 μm (exactly).
  Reference: [I31-1, 1-3.a (remarks)],[I1000, Annex A 6.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_ARE

EDCS Unit Code: 6

Symbol: a

Number of quantities which this unit of measure may represent:: 1

• Quantity: area
  Definition: The product of length and width.1 a = 1 dam² = 10² m² (exactly).
  Reference: [I31-1, 1-5.a (remarks)],[I1000, Annex A 1-4]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_ASTRONOMICAL_UNIT

EDCS Unit Code: 7

Symbol: AU

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: 1 AU = 1,495 978 7 x 10¹¹ m (approximately).
  Reference: [I31-1, 1-3.B.b]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_BAR

EDCS Unit Code: 8

Symbol: bar

Number of quantities which this unit of measure may represent:: 1

• Quantity: pressure
  Definition: The force that is exerted per unit area.1 bar = 10⁵ Pa (exactly).
  Reference: [I31-3, 3-15a (remarks)],[I1000, Annex A 3-15.1]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_BARN

EDCS Unit Code: 9

Symbol: b

Number of quantities which this unit of measure may represent:: 1

• Quantity: area
  Definition: The product of length and width.1 b = 100 fm² = 10^-28 m² (exactly).
  Reference: [I31-10, 10-3.a (remarks)]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_BECQUEREL

EDCS Unit Code: 10

Symbol: Bq

Number of quantities which this unit of measure may represent:: 1

• Quantity: activity of a radio nuclide
  Definition: The average number of spontaneous nuclear transitions from a particular energy state occurring in an amount of a radio nuclide in a small time interval, divided by that interval.1 Bq = 1 s^-1.
  Reference: [I31-0, Table 3],[I31-9, 9-33.a],[I31-10, 10-49.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_BECQUEREL_PER_CUBIC_METRE

EDCS Unit Code: 11

Symbol: Bq/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumic activity (activity concentration)
  Definition: Activity (of a radio nuclide) divided by the total volume of the sample.
  Reference: [I31-9, 9-35.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_BECQUEREL_PER_KG

EDCS Unit Code: 12

Symbol: Bq/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: massic activity (specific activity)
  Definition: Activity of a radio nuclide divided by the total mass of the sample.
  Reference: [I31-9, 9-34.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_BEL

EDCS Unit Code: 13

Symbol: B

Number of quantities which this unit of measure may represent:: 4

• Quantity: sound pressure level
  Definition: L_p = ln (p/p₀) = ln 10·lg (p/p₀) where p is the root-mean-square value of the sound pressure and the reference pressure p₀ = 20 μPa.
  Reference: [I31-7, 7-21.a]
  


• Quantity: power quantity ratio (level difference)
  Definition: The common logarithm of a power quantity ratio.1 B is the level of a power quantity when lg (P/P₀) = 1 where P and P₀ represent two powers, P₀ being a reference power.
  Reference: [I31-2, 2-10.b]
  


• Quantity: sound power level
  Definition: L_W = 1/2 ln (P/P₀) = 1/2 ln 10·lg (P/P₀) where P is the root-mean-square of the sound power and the reference power p₀ = 1 x 10^-12 W.
  Reference: [I31-7, 7-22.a]
  


• Quantity: field quantity ratio (level difference)
  Definition: Twice the common logarithm of a field quantity ratio.1 B is the level of a field quantity when 2 lg (F/F₀) = 1 where F and F₀ represent two amplitudes of the same kind, F₀ being a reference amplitude.1 B = (1/2) ln 10 Np = 1,151 293 Np (approximately).
  Reference: [I31-2, 2-9.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CANDELA

EDCS Unit Code: 14

Symbol: cd

Number of quantities which this unit of measure may represent:: 1

• Quantity: luminous intensity
  Definition: The luminous intensity, in a given direction, of a source that emits monochromatic radiation of a frequency 540 x 10¹² Hertz, and that has a radiant intensity in that direction of 1 / 683 watt per steradian.SI base unit.
  Reference: [I31-0, Table 1],[I31-6, 6-29.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CD_PER_SQ_METRE

EDCS Unit Code: 15

Symbol: cd/m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: luminance
  Definition: At a point on a surface and in a given direction, the luminous intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction.
  Reference: [I31-6, 6-32.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB

EDCS Unit Code: 16

Symbol: C

Number of quantities which this unit of measure may represent:: 3

• Quantity: electric charge (quantity of electricity)
  Definition: The integral of electric current over time.1 C = 1 s · A.
  Reference: [I31-0, Table 2],[I31-5, 5-2.a]
  


• Quantity: electric flux
  Definition: Across a surface element, the scalar product of the electric flux density and the surface element.
  Reference: [I31-5, 5-8.a]
  


• Quantity: elementary charge
  Definition: The electric charge of a proton.
  Reference: [I31-8, 8-43.a],[I31-9, 9-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_METRE

EDCS Unit Code: 17

Symbol: C · m

Number of quantities which this unit of measure may represent:: 2

• Quantity: electric dipole moment
  Definition: A vector quantity, the vector product of which with the electric field strength of a homogenous field is equal to the torque.1 C · m = 1 m · s · A.
  Reference: [I31-5, 5-14.a]
  


• Quantity: electric dipole moment of amolecule
  Definition: A vector quantity, the vector product of which with the electric field strength is equal to the torque.
  Reference: [I31-8, 8-32.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_METRE_SQD_PER_VOLT

EDCS Unit Code: 18

Symbol: C · m²/V

Number of quantities which this unit of measure may represent:: 1

• Quantity: electric polarizability of molecule
  Definition: The induced electric dipole moment divided by electric field strength.1 C · m²/V = 1 (s⁴ · A²)/kg.
  Reference: [I31-8, 8-33.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_PER_CUBIC_M

EDCS Unit Code: 19

Symbol: C/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volume charge (volume density of charge, electric charge density)
  Definition: The charge divided by volume.1 C/m³ = 1 (s · A)/m³.
  Reference: [I31-5, 5-3.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_PER_KG

EDCS Unit Code: 20

Symbol: C/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: exposure of ionizing radiation
  Definition: The total electric charge of the ions of the same sign produced when all the electrons (negative and positive) liberated by photons in an element of air are stopped in air, divided by the mass of that element.1 C/kg = 1 (s · A)/kg.
  Reference: [I31-10, 10-58.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_PER_KG_SEC

EDCS Unit Code: 21

Symbol: C/(kg · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: exposure rate of ionizing radiation
  Definition: The exposure (ionizing radiation) divided by time.1 C/(kg · s) = 1 A/kg.
  Reference: [I31-10, 10-59.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_PER_MOLE

EDCS Unit Code: 22

Symbol: C/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar charge
  Definition: The charge carried per amount of substance.1 C/mol = 1 (s · A)/mol.
  Reference: [I31-8, 8-45.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_COULOMB_PER_SQ_M

EDCS Unit Code: 23

Symbol: C/m²

Number of quantities which this unit of measure may represent:: 3

• Quantity: electric polarization
  Definition: A vector quantity equal to the electric dipole moment per unit volume of a material.
  Reference: [I31-5, 5-13.a]
  


• Quantity: electric flux density
  Definition: A vector quantity, the divergence of which is equal to the volumic charge.
  Reference: [I31-5, 5-7.a]
  


• Quantity: areic charge (surface density of charge)
  Definition: The charge divided by surface area.1 C/m² = 1 (s · A)/m².
  Reference: [I31-5, 5-4.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_M_PER_CUBIC_M

EDCS Unit Code: 24

Symbol: m³/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volume fraction (of B)
  Definition: The volume of B divided by the volume of the mixture.1 m³/m³ = 1.
  Reference: [I31-8, 8-15.a],[I31-0, 2.3.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_METRE

EDCS Unit Code: 25

Symbol: m³

Number of quantities which this unit of measure may represent:: 2

• Quantity: section modulus
  Definition: The section modulus of a plane area (section) about an axis in its plane is the second moment of area divided by the distance from the axis to the most remote point of the area.
  Reference: [I31-3, 3-21.a]
  


• Quantity: volume
  Definition: The product of length, width and height.
  Reference: [I31-1, 1-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_METRE_PER_COULOMB

EDCS Unit Code: 26

Symbol: m³/C

Number of quantities which this unit of measure may represent:: 1

• Quantity: reciprocal volumic charge (reciprocal charge density)
  Definition: The volume divided by the charge.
  Reference: [I31-13, 13-20.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_METRE_PER_KG

EDCS Unit Code: 27

Symbol: m³/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: specific volume
  Definition: The volume divided by mass.
  Reference: [I31-3, 3-4.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_METRE_PER_MOLE

EDCS Unit Code: 28

Symbol: m³/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar volume
  Definition: The volume divided by the amount of substance.
  Reference: [I31-8, 8-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CUBIC_METRE_PER_SEC

EDCS Unit Code: 29

Symbol: m³/s

Number of quantities which this unit of measure may represent:: 2

• Quantity: volume flow rate
  Definition: The volume of matter which crosses a given surface, divided by time.
  Reference: [I31-3, 3-30.a],[I31-7, 7-13.a]
  


• Quantity: recombination coefficient
  Definition: The coefficient in the law of recombination.
  Reference: [I31-10, 10-28.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_CURIE

EDCS Unit Code: 30

Symbol: Ci

Number of quantities which this unit of measure may represent:: 1

• Quantity: activity of a radio nuclide
  Definition: The average number of spontaneous nuclear transitions from a particular energy state occurring in an amount of a radio nuclide in a small time interval, divided by that interval.1 Ci = 3.7 x 10¹⁰ Bq (exactly).
  Reference: [I31-9, 9-33.a (remarks)],[I1000, Annex A 9-33]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_DAY

EDCS Unit Code: 31

Symbol: d

Number of quantities which this unit of measure may represent:: 1

• Quantity: time
  Definition: 1 d = 24 h = 86 400 s (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-7.d]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB

EDCS Unit Code: 32

Symbol: dB

Number of quantities which this unit of measure may represent:: 2

• Quantity: power quantity ratio (level difference)
  Definition: A dimensionless quantity used to describe a comparison of power levels.1 dB = 10^-1 B (exactly) = 1,151 293 x 10^-1Np (approximately).
  Reference: [I31-2, 2-10.a (remarks)],[I1000, Annex A 7-21]
  


• Quantity: field quantity ratio (level difference)
  Definition: A dimensionless quantity used to describe a comparison of field levels.1 dB = 10^-1 B (exactly) = 1,151 293 x 10^-1Np (approximately).
  Reference: [I31-2, 2-9.a (remarks)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_PER_METRE

EDCS Unit Code: 33

Symbol: dB/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: power ratio (level difference) gradient
  Definition: The rate of power ratio change as a function of distance.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_PER_METRE_KHZ

EDCS Unit Code: 34

Symbol: dB/(m · kHz)

Number of quantities which this unit of measure may represent:: 1

• Quantity: power ratio (level difference) distance and frequency gradient
  Definition: The rate of power ratio change as a function of distance and spectral frequency.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_PER_OCTAVE

EDCS Unit Code: 35

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: power ratio (level difference) frequency gradient
  Definition: The rate of power ratio change as a function of spectral frequency octave.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_PER_SQ_METRE

EDCS Unit Code: 36

Symbol: dB/m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: areic power ratio (level difference)
  Definition: The power level divided by area.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_PER_SQ_METRE_KHZ

EDCS Unit Code: 37

Symbol: dB/(m² · kHz)

Number of quantities which this unit of measure may represent:: 1

• Quantity: gradient of power ratio (level difference) distance and frequency gradient
  Definition: The rate of change of power ratio change as a function of distance and spectral frequency.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DB_REF_ONE_MICROPASCAL

EDCS Unit Code: 38

Symbol: dB (re 1 μPa)

Number of quantities which this unit of measure may represent:: 1

• Quantity: pressure power quantity ratio (level)
  Definition: 1 dB (re 1 μPa) is the level of a pressure power quantity when lg (P/P₀) = 0,1 where P and P₀ represent two pressure powers, P₀ being a reference power of 1 μPa.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DECAY_RATE

EDCS Unit Code: 39

Symbol: %/min

Number of quantities which this unit of measure may represent:: 1

• Quantity: decay constant (disintegration constant)
  Definition: Probability of decay of an active species in a small time interval, divided by that interval.1 %/min = 1 / 6 x 10^-3 1/s (exactly).
  Reference: [I31-9, 9-36.a,I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DEGREE_ARC

EDCS Unit Code: 40

Symbol: º

Number of quantities which this unit of measure may represent:: 2

• Quantity: Bragg angle
  Definition: The angle between an incident X-ray beam and a set of crystal planes for which the secondary radiation displays maximum intensity as a result of constructive interference.
  Reference: [I31-13, 13-4.b]
  


• Quantity: plane angle
  Definition: The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle.1º = (π / 180) rad (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-1.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DEGREE_C

EDCS Unit Code: 41

Symbol: ºC

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermodynamic temperature
  Definition: A special name for the kelvin for use in stating values of Celsius temperature.t = T - T₀ where T₀ = 273,15 K (exactly).
  Reference: [I31-0, Table 2],[I31-4, 4-2.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DEGREE_C_PER_HOUR

EDCS Unit Code: 42

Symbol: ºC/h

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermodynamic temperature change rate
  Definition: The thermodynamic temperature change over an interval of time, divided by that time.1 ºC/h = 1 / 3,6 x 10^-3 K/s (exactly).
  Reference: [I31-0, 2.3.2.2 and 2.3.4 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DEGREE_C_PER_METRE

EDCS Unit Code: 43

Symbol: ºC/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: lineic thermodynamic temperature gradient
  Definition: The thermodynamic temperature change over a distance, divided by that distance.1 ºC/m = 1 K/m (exactly).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_DEGREE_C_PER_SEC

EDCS Unit Code: 44

Symbol: ºC/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermodynamic temperature change rate
  Definition: The thermodynamic temperature change over an interval of time, divided by that time.1 ºC/s = 1 K/s (exactly).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_ELECTRONVOLT

EDCS Unit Code: 45

Symbol: eV

Number of quantities which this unit of measure may represent:: 12

• Quantity: maximum beta particle energy
  Definition: Maximum energy of the energy spectrum in a beta disintegration process.
  Reference: [I31-9, 9-39.b]
  


• Quantity: energy
  Definition: The kinetic energy acquired by an electron in passing through a potential difference of 1 volt in a vacuum. Its value is experimentally determined as 1,602 177 x 10^-19 J (approximately).
  Reference: [I31-0, Table 6],[I31-9, 9-32.b]
  


• Quantity: alpha disintegration energy
  Definition: The sum of the kinetic energy of the alpha particle produced in the disintegration process and the recoil energy of the product atom in the reference frame in which the emitting nucleus is at rest before its disintegration.
  Reference: [I31-9, 9-38.b]
  


• Quantity: beta disintegration energy
  Definition: Sum of the maximum beta particle energy and the recoil energy of the atom produced in the reference frame in which the emitting nucleus is at rest before its disintegration.
  Reference: [I31-9, 9-40.b]
  


• Quantity: resonance energy
  Definition: Kinetic energy of an incident particle, in the reference frame of the target, corresponding to a resonance in a nuclear reaction.
  Reference: [I31-10, 10-2.b]
  


• Quantity: work function
  Definition: The energy difference between an electron at rest at infinity and an electron at the Fermi level in the interior of a substance.
  Reference: [I31-13, 13-25.b]
  


• Quantity: gap energy
  Definition: Difference in energy between lowest level of conduction band and highest level of valence band.
  Reference: [I31-13, 13-28.b]
  


• Quantity: exchange integral
  Definition: The interaction energy arising from electron exchange.
  Reference: [I31-13, 13-35.b]
  


• Quantity: electron affinity
  Definition: The energy difference between an electron at rest at infinity and an electron at the lowest level of the conduction band in an insulator or semiconductor.
  Reference: [I31-13, 13-26.b]
  


• Quantity: average energy loss per ion pair formed (average energy loss per elementary charge of the same sign produced)
  Definition: The initial kinetic energy of an ionizing charged particle, divided by the total ionization produced by that particle.
  Reference: [I31-10, 10-25.b]
  


• Quantity: reaction energy
  Definition: In a nuclear reaction, the sum of the kinetic and photon energies of the reaction products minus the sum of the kinetic and photon energies of the reactants.
  Reference: [I31-10, 10-1.b]
  


• Quantity: Fermi energy
  Definition: In a metal, the highest energy of occupied states at zero thermodynamic temperature.
  Reference: [I31-13, 13-28.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_ELECTRONVOLT_M_SQD

EDCS Unit Code: 46

Symbol: eV · m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: total atomic stopping power
  Definition: The total linear stopping power divided by the number density of the atoms in the substance.1 eV · m² = (1,602 177 33 ± 0,000 000 49) x 10^-19 J · m² (approximately).
  Reference: [I31-10, 10-19.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_ELECTRONVOLT_M_SQD_PER_KG

EDCS Unit Code: 47

Symbol: (eV · m²)/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: total mass stopping power
  Definition: The total linear stopping power divided by the volumic mass of the substance.1 (eV · m²)/kg = (1,602 177 33 ± 0,000 000 49) x 10^-19 (J · m²)/kg (approximately).
  Reference: [I31-10, 10-20.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_ELECTRONVOLT_PER_METRE

EDCS Unit Code: 48

Symbol: eV/m

Number of quantities which this unit of measure may represent:: 2

• Quantity: linear energy transfer
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance.
  Reference: [I31-10, 10-54.b]
  


• Quantity: total linear stopping power
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance; -dE/dx.1 eV/m = (1,602 177 33 ± 0,000 000 49) x 10^-19 J/m (approximately).
  Reference: [I31-10, 10-18.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_FARAD

EDCS Unit Code: 49

Symbol: F

Number of quantities which this unit of measure may represent:: 1

• Quantity: capacitance
  Definition: The charge divided by potential difference.1 F = 1 C/V = 1 (s⁴ · A²)/(m² · kg).
  Reference: [I31-0, Table 2],[I31-5, 5-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_FARAD_PER_METRE

EDCS Unit Code: 50

Symbol: F/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: permittivity
  Definition: The ability of a material to resist the formation of an electric field within it.1 F/m = 1 (s⁴ · A²)/(m³ · kg).
  Reference: [I31-5, 5-10.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_FOOT

EDCS Unit Code: 51

Symbol: ft

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: 1 ft = 0,304 8 m (exactly).
  Reference: [I31-1, 1-3.A.b]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_GAL

EDCS Unit Code: 52

Symbol: Gal

Number of quantities which this unit of measure may represent:: 1

• Quantity: acceleration
  Definition: The change in velocity divided by time.1 Gal = 0,01 m/s² (exactly).
  Reference: [I31-1, 1-11.B.a]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_GEOPOTENTIAL_METRE

EDCS Unit Code: 53

Symbol: gpm

Number of quantities which this unit of measure may represent:: 1

• Quantity: geopotential energy height (geopotential specific energy)
  Definition: A height proportional to the potential energy of mass (geopotential) at this height relative to the geoid.The geopotential metre varies with geodetic latitude. On <EARTH> at mid-latitudes it equals 0,98 m (approximately).
  Reference: [GMET, "geopotential height"]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GON

EDCS Unit Code: 54

Symbol: gon

Number of quantities which this unit of measure may represent:: 1

• Quantity: plane angle
  Definition: The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle.1 gon = π / 200 rad = 0,015 707 96 rad (exactly).
  Reference: [I31-1, 1-1.B.a],[I1000, Annex A 1-1]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_GRAM

EDCS Unit Code: 55

Symbol: g

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: For historical reasons the name of the base unit for mass, the kg, contains the name of the SI prefix "kilo".A gram is a special name given to unit kg x 10^-3 that is used instead of "millikilogram".
  Reference: [I31-0, 3.2.4]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAM_PER_CUBIC_CM

EDCS Unit Code: 56

Symbol: g/cm³

Number of quantities which this unit of measure may represent:: 2

• Quantity: volumic mass (mass density)
  Definition: The mass divided by the volume.1 g/cm³ = 10³ kg/m³ (exactly).
  Reference: [I31-3, 3-2.b],[I31-0, 2.3.2.3],[I31-7, 7-8.a]
  


• Quantity: mass concentration (of B)
  Definition: The amount of substance of B divided by the volume of the mixture.
  Reference: [I31-8, 8-11.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAM_PER_CUBIC_M

EDCS Unit Code: 57

Symbol: g/m³

Number of quantities which this unit of measure may represent:: 2

• Quantity: mass concentration (of B)
  Definition: The amount of substance of B divided by the volume of the mixture.
  Reference: [I31-8, 8-11.a]
  


• Quantity: volumic mass (mass density)
  Definition: The mass divided by the volume.1 g/m³ = 10^-3 kg/m³ (exactly).
  Reference: [I31-3, 3-2.b],[I31-0, 2.3.2.3],[I31-7, 7-8.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAM_PER_GRAM

EDCS Unit Code: 58

Symbol: g/g

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 g/g = 1 kg/kg = 1.
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAM_PER_KILOGRAM

EDCS Unit Code: 59

Symbol: g/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 g/kg = 10^-3 kg/kg = 10^-3 (exactly).
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAY

EDCS Unit Code: 60

Symbol: Gy

Number of quantities which this unit of measure may represent:: 2

• Quantity: absorbed dose of ionizing radiation
  Definition: For any ionizing radiation, the energy imparted to an element of irradiated matter divided by the mass of this element.1 Gy = 1 J/kg = 1 m²/s².
  Reference: [I31-0, Table 3],[I31-10, 10-51.a]
  


• Quantity: kerma
  Definition: For indirectly ionizing (uncharged) particles, the sum of the initial kinetic energies of all charged particles liberated in an element of matter, divided by the mass of that element.
  Reference: [I31-10, 10-55.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_GRAY_PER_SECOND

EDCS Unit Code: 61

Symbol: Gy/s

Number of quantities which this unit of measure may represent:: 2

• Quantity: absorbed dose rate of ionizing radiation
  Definition: The absorbed dose of ionizing radiation over an interval of time, divided by that time.1 Gy/s = 1 W/kg = 1 m²/s³.
  Reference: [I31-10, 10-53.a]
  


• Quantity: kerma rate
  Definition: For indirectly ionizing (uncharged) particles, the sum of the initial kinetic energies of all charged particles liberated in an element of matter in a small interval of time, divided by the mass of that element and the interval of time.
  Reference: [I31-10, 10-56.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_HECTARE

EDCS Unit Code: 62

Symbol: ha

Number of quantities which this unit of measure may represent:: 1

• Quantity: area
  Definition: The product of length and width.1 ha = 1 hm² = 10⁴ m² (exactly).
  Reference: [I31-1, 1-5.a (remarks)]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_HENRY

EDCS Unit Code: 63

Symbol: H

Number of quantities which this unit of measure may represent:: 2

• Quantity: permeance
  Definition: The reciprocal of the reluctance of a magnetic circuit, determined by the magnetic flux divided by the magnetomotive force.
  Reference: [I31-5, 5-39.a]
  


• Quantity: magnetic inductance
  Definition: For a thin conducting loop, the magnetic flux through the loop, caused by an electric current in the loop, divided by that current.For two thin conducting loops (m and n), the magnetic flux through one loop, due to an electric current in the other loop, divided by that current.1 H = 1 Wb/A = 1 (m² · kg)/(s² · A²).
  Reference: [I31-0, Table 2],[I31-5, 5-22.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_HENRY_PER_METRE

EDCS Unit Code: 64

Symbol: H/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: magnetic permeability
  Definition: The ability of a substance to acquire magnetization when placed in a magnetic field.1 H/m = 1 (m · kg)/(s² · A²).
  Reference: [I31-5, 5-24.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_HERTZ

EDCS Unit Code: 65

Symbol: Hz

Number of quantities which this unit of measure may represent:: 2

• Quantity: rotational frequency
  Definition: The number of revolutions divided by time.1 Hz = 1 s^-1.
  Reference: [I31-5, 5-41.a]
  


• Quantity: frequency
  Definition: The number of cycles divided by time.1 Hz = 1 s^-1.
  Reference: [I31-0, Table 2],[I31-2, 2-3.a],[I31-6, 6-1.a],[I31-7, 7-2.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_HOUR

EDCS Unit Code: 66

Symbol: h

Number of quantities which this unit of measure may represent:: 1

• Quantity: time
  Definition: 1 h = 60 min = 3 600 s (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-7.c]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INT_SOLAR_FLUX_UNIT

EDCS Unit Code: 67

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: international solar flux unit
  Definition: The unit of radio emission from the <SUN>, measured at a wavelength of 10.7 cm (approximately 2 800 MHz).1 SFU = 10⁴ Jy = 10^-22 W/(m² · Hz) (exactly).
  Reference: [I31-0, 2.3.1 and 2.3.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_CM

EDCS Unit Code: 68

Symbol: 1/cm³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumetric entity density (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The number of molecules or particles divided by volume.1/cm³ = 10^-6 1/m³.
  Reference: [I31-10, 10-27.a],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_CM_SEC

EDCS Unit Code: 69

Symbol: 1/(cm³ · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumetric entity emittance or capture rate (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The number of molecules or particles divided by volume, per time.1/(cm³ · s) = 10^-6 1/(m³ · s).
  Reference: [I31-10, 10-35.a],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_METRE

EDCS Unit Code: 70

Symbol: 1/m³

Number of quantities which this unit of measure may represent:: 4

• Quantity: ion number density (ion density)
  Definition: The number of positive or negative ions in a volume element, divided by that element.
  Reference: [I31-10, 10-27.a]
  


• Quantity: neutron number density
  Definition: The number of free neutrons in a volume element, divided by that element.
  Reference: [I31-10, 10-29.a]
  


• Quantity: volumetric entity density (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The number of molecules or particles divided by their volume.
  Reference: [I31-8, 8-10.a]
  


• Quantity: electron number density (volumic electron number)
  Definition: The number density of electrons in conduction band.
  Reference: [I31-13, 13-30.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_METRE_EV

EDCS Unit Code: 71

Symbol: 1/(m³ · eV)

Number of quantities which this unit of measure may represent:: 1

• Quantity: density of states
  Definition: A function of the energy in a solid given by the number of permitted quantum states in the energy range between E and E + dE, per unit volume of the material.1/(m³ · eV) = (6,241 5061 4 ± 0,0001 0011 9) x 10¹⁸ 1/(m³ · J) (approximately).
  Reference: [I31-13, 13-17.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_METRE_JOULE

EDCS Unit Code: 72

Symbol: 1/(m³ · J)

Number of quantities which this unit of measure may represent:: 1

• Quantity: density of states
  Definition: A function of the energy in a solid given by the number of permitted quantum states in the energy range between E and E + dE, per unit volume of the material.
  Reference: [I31-13, 13-17.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_CUBIC_METRE_SEC

EDCS Unit Code: 73

Symbol: 1/(m³ · s)

Number of quantities which this unit of measure may represent:: 2

• Quantity: volumetric entity emittance or capture rate (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The number of molecules or particles divided by volume, per time.
  Reference: [I31-10, 10-34.a]
  


• Quantity: slowing-down density
  Definition: The number density of neutrons slowing down past a given energy value in a small time interval, divided by that interval.
  Reference: [I31-10, 10-35.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_HENRY

EDCS Unit Code: 74

Symbol: 1/H

Number of quantities which this unit of measure may represent:: 1

• Quantity: reluctance
  Definition: The magnetic potential difference divided by magnetic flux.1/H = 1 A/Wb = 1 (s² · A²)/(m² · kg).
  Reference: [I31-5, 5-38.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_KELVIN

EDCS Unit Code: 75

Symbol: 1/K

Number of quantities which this unit of measure may represent:: 3

• Quantity: relative pressure coefficient
  Definition: The coefficient of pressure change divided by the thermodynamic temperature change.
  Reference: [I31-4, 4-3.a]
  


• Quantity: cubic expansion coefficient
  Definition: The coefficient of volumic expansion divided by the thermodynamic temperature change.
  Reference: [I31-4, 4-3.a]
  


• Quantity: linear expansion coefficient
  Definition: The coefficient of linear expansion divided by the thermodynamic temperature change.
  Reference: [I31-4, 4-3.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_METRE

EDCS Unit Code: 76

Symbol: 1/m

Number of quantities which this unit of measure may represent:: 9

• Quantity: linear ionization by a particle
  Definition: The number of elementary charges of the same sign produced over an element of length of the path of an ionizing charged particle, divided by that element.
  Reference: [I31-10, 10-23.a]
  


• Quantity: volumic cross-section (macroscopic cross-section)
  Definition: Sum of the cross-sections for a reaction or process of a specified type over all atoms in a given volume, divided by that volume.
  Reference: [I31-10, 10-7.a]
  


• Quantity: vergence (lens power)
  Definition: The reciprocal of the distance between a point of reference and the point at which a pair of converging or diverging light rays intersect.
  Reference: [I31-6, 6-46.a]
  


• Quantity: linear attenuation coefficient (linear extinction coefficient)
  Definition: The ratio of a quantity which is a function of distance divided by the distance between the measurements.
  Reference: [I31-6, 6-42.a],[I31-10, 10-13.a]
  


• Quantity: curvature
  Definition: The reciprocal of a radius of curvature.
  Reference: [I31-1, 1-4.a]
  


• Quantity: angular reciprocal lattice vector
  Definition: A vector whose scalar products with all fundamental lattice vectors are integral multiples of 2π.
  Reference: [I31-13, 13-2.a]
  


• Quantity: angular repetency (angular wave number)
  Definition: The reciprocal of the wavelength or the number of waves per unit angle along the direction of propagation.
  Reference: [I31-2, 2-7.b],[I31-6, 6-5.b],[I31-7, 7-7.b],[I31-13, 13-10.b]
  


• Quantity: fundamental reciprocal lattice vectors
  Definition: The fundamental translation vectors for the reciprocal lattice.
  Reference: [I31-13, 13-2.a]
  


• Quantity: repetency (wavenumber)
  Definition: The reciprocal of the wavelength or the number of waves per unit length along the direction of propagation.
  Reference: [I31-2, 2-6.a],[I31-6, 6-4.a],[I31-7, 7-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_MICRON

EDCS Unit Code: 77

Symbol: 1/μm

Number of quantities which this unit of measure may represent:: 2

• Quantity: angular repetency (angular wave number)
  Definition: The reciprocal of the wavelength or the number of waves per unit angle along the direction of propagation.1 μm^-1 = 10⁶ 1/m (exactly).
  Reference: [I31-2, 2-7.b],[I31-6, 6-5.b],[I31-7, 7-7.b],[I31-13, 13-10.b]
  


• Quantity: repetency (wavenumber)
  Definition: The reciprocal of the wavelength or the number of waves per unit length along the direction of propagation.
  Reference: [I31-2, 2-6.a],[I31-6, 6-4.a],[I31-7, 7-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_MOLE

EDCS Unit Code: 78

Symbol: 1/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar density (Avogadro constant)
  Definition: The number of molecules divided by the amount of substance.
  Reference: [I31-8, 8-4.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_PASCAL

EDCS Unit Code: 79

Symbol: 1/Pa

Number of quantities which this unit of measure may represent:: 4

• Quantity: bulk compressibility
  Definition: The reciprocal of the bulk modulus.
  Reference: [I31-3, 3-19.a]
  


• Quantity: isothermal compressibility
  Definition: At a constant temperature, the extent to which a material reduces its volume when it is subjected to compressive stresses.
  Reference: [I31-4, 4-5.a]
  


• Quantity: isentropic compressibility
  Definition: At a constant value of entropy, the extent to which a material reduces its volume when it is subjected to compressive stresses.
  Reference: [I31-4, 4-5.a]
  


• Quantity: compressibility
  Definition: The extent to which a material reduces its volume when it is subjected to compressive stresses.1/Pa = 1 (m · s²)/kg.
  Reference: [I31-3, 3-19.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_RADIAN

EDCS Unit Code: 80

Symbol: 1/rad

Number of quantities which this unit of measure may represent:: 1

• Quantity: reciprocal plane angle
  Definition: The reciprocal of the angle between two half-lines terminating at the same point is the ratio of the radius of a circle (with its centre at that point) to the length of the included arc of that circle.1 rad^-1 = 1 m/m = 1.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SEC_STERADIAN

EDCS Unit Code: 81

Symbol: 1/(s · sr)

Number of quantities which this unit of measure may represent:: 1

• Quantity: photon intensity
  Definition: In a given direction from a source, the photon flux leaving the source, or an element of the source, in an element of solid angle containing the given direction, divided by that element of solid angle.
  Reference: [I31-6, 6-24.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SECOND

EDCS Unit Code: 82

Symbol: 1/s

Number of quantities which this unit of measure may represent:: 7

• Quantity: photon flux
  Definition: The number of photons in an incident beam of light received by a surface over a time interval.
  Reference: [I31-6, 6-23.a]
  


• Quantity: rotational frequency
  Definition: The number of revolutions divided by time.
  Reference: [I31-2, 2-3.b],[I31-5, 5-41.b]
  


• Quantity: pulsatance
  Definition: The angular velocity of a periodic quantity.
  Reference: [I31-2, 2-4.b],[I31-5, 5-42.b],[I31-7, 7-4.b]
  


• Quantity: decay constant (disintegration constant)
  Definition: Probability of decay in a small time interval, divided by that interval.
  Reference: [I31-9, 9-36.a]
  


• Quantity: angular frequency
  Definition: The number of cycles or revolutions divided by time.
  Reference: [I31-6, 6-2.b],[I31-9, 9-14.b],[I31-9, 9-15.b],[I31-13, 13-11.b]
  


• Quantity: angular frequency
  Definition: The frequency of rotation or vibration.
  Reference: [I31-2, 2-4.b],[I31-5, 5-42.b],[I31-7, 7-4.b]
  


• Quantity: damping coefficient
  Definition: The factor defining the rate of exponential amplitude decay in a periodic or acoustic system.
  Reference: [I31-2, 2-11.a],[I31-7, 7-23.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_CM_SEC_SR_EV

EDCS Unit Code: 83

Symbol: 1/(cm² · s · sr · eV)

Number of quantities which this unit of measure may represent:: 1

• Quantity: particle flux density within an energy range
  Definition: At a point on a surface and in a given direction, the charged particle flux of an element of the surface within an energy range of 1 eV centered on a given particle energy, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction, and divided by an element of solid angle containing the given direction.1/(cm² · s · sr · eV) = 10^-6 1/(m² · s · sr · eV) (exactly).
  Reference: [I31-0, 2.3.2.3 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_CM_SEC_SR_KEV

EDCS Unit Code: 84

Symbol: 1/(cm² · s · sr · KeV)

Number of quantities which this unit of measure may represent:: 1

• Quantity: particle flux density within an energy range
  Definition: At a point on a surface and in a given direction, the charged particle flux of an element of the surface within an energy range of 1 KeV centered on a given particle energy, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction, and divided by an element of solid angle containing the given direction.1/(cm² · s · sr · KeV) = 10^-9 1/(m² · s · sr · eV) (exactly, assuming an even distribution of particle energies).
  Reference: [I31-0, 2.3.2.3 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_CM_SEC_SR_MEV

EDCS Unit Code: 85

Symbol: 1/(cm² · s · sr · MeV)

Number of quantities which this unit of measure may represent:: 1

• Quantity: particle flux density within an energy range
  Definition: At a point on a surface and in a given direction, the charged particle flux of an element of the surface within an energy range of 1 MeV centered on a given particle energy, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction, and divided by an element of solid angle containing the given direction.1/(cm² · s · sr · MeV) = 10^-12 1/(m² · s · sr · eV) (exactly, assuming an even distribution of particle energies).
  Reference: [I31-0, 2.3.2.3 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_CM_SEC_STERADIAN

EDCS Unit Code: 86

Symbol: 1/(cm² · s · sr)

Number of quantities which this unit of measure may represent:: 1

• Quantity: photon luminance (photon radiance)
  Definition: At a point on a surface and in a given direction, the photon intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction.1/(cm² · s · sr) = 10^-4 1/(m² · s · sr) (exactly).
  Reference: [I31-6, 6-25.a],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_M_SEC_SR_EV

EDCS Unit Code: 87

Symbol: 1/(m² · s · sr · eV)

Number of quantities which this unit of measure may represent:: 1

• Quantity: particle flux density within an energy range
  Definition: At a point on a surface and in a given direction, the charged particle flux of an element of the surface within an energy range of 1 eV centered on a given particle energy, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction, and divided by an element of solid angle containing the given direction.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_M_SEC_STERADIAN

EDCS Unit Code: 88

Symbol: 1/(m² · s · sr)

Number of quantities which this unit of measure may represent:: 1

• Quantity: photon luminance (photon radiance)
  Definition: At a point on a surface and in a given direction, the photon intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction.
  Reference: [I31-6, 6-25.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_METRE

EDCS Unit Code: 89

Symbol: 1/m²

Number of quantities which this unit of measure may represent:: 2

• Quantity: areal entity density (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: At a given point in space, the number of particles incident on a small sphere, divided by the cross-sectional area of that sphere.
  Reference: [I31-6, 6-28.a]
  


• Quantity: particle fluence
  Definition: At a given point in space, the number of particles incident on a small sphere, divided by the cross-sectional area of that sphere.
  Reference: [I31-10, 10-8.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_SQ_METRE_SEC

EDCS Unit Code: 90

Symbol: 1/(m² · s)

Number of quantities which this unit of measure may represent:: 4

• Quantity: photon irradiance
  Definition: At a point on a surface, the photon flux incident on an element of the surface, divided by the area of that element and by the time interval.
  Reference: [I31-6, 6-27.a]
  


• Quantity: current density of particles
  Definition: A vector quantity, the integral of whose normal component over any surface is equal to the net number of particles passing through that surface in a small time interval divided by that interval.
  Reference: [I31-10, 10-12.a]
  


• Quantity: particle fluence rate (particle flux density)
  Definition: At a given point in space, the number of particles incident on a small sphere in a small time interval, divided by the cross-sectional area of that sphere and by the time interval.
  Reference: [I31-10, 10-9.a],[I31-10, 10-31.a]
  


• Quantity: photon exitance
  Definition: At a point on a surface, the photon flux leaving an element of the surface, divided by the area of that element and by the time interval.
  Reference: [I31-6, 6-26.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_STERADIAN

EDCS Unit Code: 91

Symbol: 1/sr

Number of quantities which this unit of measure may represent:: 1

• Quantity: reciprocal solid angle
  Definition: The reciprocal of a solid angle of a cone is the ratio of the square of the radius of a sphere (with its centre at the apex of that cone) to the area cut out on a spherical surface.1 sr^-1 = 1 m²/m² = 1.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_STERADIAN_METRE

EDCS Unit Code: 92

Symbol: 1/(sr · m)

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral reciprocal solid angle
  Definition: The reciprocal of a solid angle of a cone is the ratio of the square of the radius of a sphere (with its centre at the apex of that cone) to the area cut out on a spherical surface, as a function of radiant wavelength.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_INV_STERADIAN_MICRON

EDCS Unit Code: 93

Symbol: 1/(sr · μm)

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral reciprocal solid angle
  Definition: The reciprocal of a solid angle of a cone is the ratio of the square of the radius of a sphere (with its centre at the apex of that cone) to the area cut out on a spherical surface, as a function of radiant wavelength.1/(sr · μm) = 10⁶ 1/(sr · m) (exactly).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JANSKY

EDCS Unit Code: 94

Symbol: Jy

Number of quantities which this unit of measure may represent:: 1

• Quantity: flux density
  Definition: The amount of a given type of radiation that crosses a specified area within a specified period.1 Jy = 10^-26 W/(m² · Hz) (exactly).
  Reference: [I31-0, 2.3.1]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE

EDCS Unit Code: 95

Symbol: J

Number of quantities which this unit of measure may represent:: 18

• Quantity: heat (quantity of heat)
  Definition: Energy that is the result of the temperature difference between the boundary of a system and its surrounding environment.
  Reference: [I31-4, 4-6.a]
  


• Quantity: radiant energy
  Definition: The energy emitted, transferred or received as radiation.
  Reference: [I31-6, 6-7.a]
  


• Quantity: maximum beta particle energy
  Definition: Maximum energy of the energy spectrum in a beta disintegration process.
  Reference: [I31-9, 9-39.a]
  


• Quantity: average energy loss per ion pair formed (average energy loss per elementary charge of the same sign produced)
  Definition: The initial kinetic energy of an ionizing charged particle, divided by the total ionization produced by that particle.
  Reference: [I31-10, 10-25.a]
  


• Quantity: resonance energy
  Definition: Kinetic energy of an incident particle, in the reference frame of the target, corresponding to a resonance in a nuclear reaction.
  Reference: [I31-10, 10-2.a]
  


• Quantity: exchange integral
  Definition: The interaction energy arising from electron exchange.
  Reference: [I31-13, 13-35.a]
  


• Quantity: reaction energy
  Definition: In a nuclear reaction, the sum of the kinetic and photon energies of the reaction products minus the sum of the kinetic and photon energies of the reactants.
  Reference: [I31-10, 10-1.a]
  


• Quantity: Fermi energy
  Definition: In a metal, the highest energy of occupied states at zero thermodynamic temperature.
  Reference: [I31-13, 13-28.a]
  


• Quantity: electron affinity
  Definition: The energy difference between an electron at rest at infinity and an electron at the lowest level of the conduction band in an insulator or semiconductor.
  Reference: [I31-13, 13-26.a]
  


• Quantity: alpha disintegration energy
  Definition: The sum of the kinetic energy of the alpha particle produced in the disintegration process and the recoil energy of the product atom in the reference frame in which the emitting nucleus is at rest before its disintegration.
  Reference: [I31-9, 9-38.a]
  


• Quantity: level width
  Definition: The uncertainty in energy (full width at half maximum) of an unstable state due to the finite lifetime of the state.
  Reference: [I31-9, 9-32.a]
  


• Quantity: work function
  Definition: The energy difference between an electron at rest at infinity and an electron at the Fermi level in the interior of a substance.
  Reference: [I31-13, 13-25.a]
  


• Quantity: energy
  Definition: The amount of work.1 J = 1 N·m = 1 (m² · kg)/s².
  Reference: [I31-0, Table 2],[I31-3, 3-26.a]
  


• Quantity: energy imparted
  Definition: The energy imparted by ionizing radiation to the matter in a given volume is the difference between the sum of the energies of all the directly ionizing (charged) and indirectly ionizing (uncharged) particles which have entered the volume and the sum of the energies of all those which have left it, minus the energy equivalent of any increase in rest mass that has taken place in nuclear or elementary particle reactions within the volume.
  Reference: [I31-10, 10-50.a]
  


• Quantity: gap energy
  Definition: Difference in energy between lowest level of conduction band and highest level of valence band.
  Reference: [I31-13, 13-28.b]
  


• Quantity: mean energy imparted
  Definition: The expectation value of the energy imparted.
  Reference: [I31-10, 10-50.a]
  


• Quantity: enthalpy
  Definition: Heat content.
  Reference: [I31-4, 4-20.a]
  


• Quantity: beta disintegration energy
  Definition: Sum of the maximum beta particle energy and the recoil energy of the atom produced in the reference frame in which the emitting nucleus is at rest before its disintegration.
  Reference: [I31-9, 9-40.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_METRE_SQD

EDCS Unit Code: 96

Symbol: J · m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: total atomic stopping power
  Definition: The total linear stopping power divided by the number density of the atoms in the substance.1 J · m² = 1 (m⁴ · kg)/s².
  Reference: [I31-10, 10-19.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_METRE_SQD_PER_KG

EDCS Unit Code: 97

Symbol: (J · m²)/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: total mass stopping power
  Definition: The total linear stopping power divided by the volumic mass of the substance.1 (J · m²)/kg = 1 m⁴/s².
  Reference: [I31-10, 10-20.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_CUBIC_M

EDCS Unit Code: 98

Symbol: J/m³

Number of quantities which this unit of measure may represent:: 3

• Quantity: radiant energy density
  Definition: The radiant energy in an element of volume, divided by that element.
  Reference: [I31-6, 6-8.a]
  


• Quantity: sound energy density (volumic sound energy)
  Definition: The mean sound energy in a given volume divided by that volume.
  Reference: [I31-7, 7-15.a]
  


• Quantity: volumic electromagnetic energy (electromagnetic energy density)
  Definition: The energy in an element of volume, divided by that element.1 J/m³ = 1 kg/(m · s²).
  Reference: [I31-5, 5-30.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_GRAM_K

EDCS Unit Code: 99

Symbol: J/(g · K)

Number of quantities which this unit of measure may represent:: 2

• Quantity: massic entropy (specific entropy)
  Definition: The heat entropy divided by mass.
  Reference: [I31-4, 4-19.a]
  


• Quantity: massic heat capacity (specific heat capacity)
  Definition: The heat capacity divided by mass.1 J/(g · K) = 10³ J/(kg · K) (exactly).
  Reference: [I31-4, 4-16.a],[I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_KELVIN

EDCS Unit Code: 100

Symbol: J/K

Number of quantities which this unit of measure may represent:: 3

• Quantity: entropy
  Definition: When a small quantity of heat dQ is received by a system the thermodynamic temperature of which is T, the entropy of the system is increased by dQ/T, provided that no irreversible change takes place in the system.
  Reference: [I31-4, 4-18.a]
  


• Quantity: heat capacity
  Definition: The quantity dQ/dT, when the temperature of a system is increased by dT as a result of the addition of a small quantity of heat dQ.1 J/K = 1 (m² · kg)/(s² · K).
  Reference: [I31-4, 4-15.a]
  


• Quantity: Boltzmann constant
  Definition: A constant equal to 1,38 x 10^-23 J/K, used in statistical physics.
  Reference: [I31-8, 8-37.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_KELVIN_MOLE

EDCS Unit Code: 101

Symbol: J/(K · mol)

Number of quantities which this unit of measure may represent:: 3

• Quantity: molar gas constant
  Definition: The universal constant of proportionality in the ideal gas law: pV_m = RT.
  Reference: [I31-8, 8-36.a]
  


• Quantity: molar heat capacity
  Definition: The heat capacity divided by the amount of substance.1 J/(K · mol) = 1 (m² · kg)/(s² · K · mol).
  Reference: [I31-8, 8-8.a]
  


• Quantity: molar entropy
  Definition: The heat entropy divided by the amount of substance.
  Reference: [I31-8, 8-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_KG

EDCS Unit Code: 102

Symbol: J/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: specific energy
  Definition: The energy divided by mass.1 J/kg = 1 m²/s².
  Reference: [I31-4, 4-21.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_KG_KELVIN

EDCS Unit Code: 103

Symbol: J/(kg · K)

Number of quantities which this unit of measure may represent:: 2

• Quantity: massic entropy (specific entropy)
  Definition: The heat entropy divided by mass.
  Reference: [I31-4, 4-19.a]
  


• Quantity: massic heat capacity (specific heat capacity)
  Definition: The heat capacity divided by mass.1 J/(kg · K) = 1 m²/(s² · K).
  Reference: [I31-4, 4-16.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_KM

EDCS Unit Code: 104

Symbol: J/km

Number of quantities which this unit of measure may represent:: 2

• Quantity: linear energy transfer
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance.1 J/km = 10^-3 J/m (exactly).
  Reference: [I31-10, 10-54.a]
  


• Quantity: total linear stopping power
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance; -dE/dx.1 J/km = 1 x 10^-3 J/m (exactly).
  Reference: [I31-10, 10-18.a,I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_M_FOURTH_PWR

EDCS Unit Code: 105

Symbol: J/m⁴

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral concentration of radiant energy density (in terms of wavelength)
  Definition: The radiant energy density in an infinitesimal wavelength interval, divided by the range of that interval.1 J/m⁴ = 1 kg/(m² · s²).
  Reference: [I31-6, 6-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_METRE

EDCS Unit Code: 106

Symbol: J/m

Number of quantities which this unit of measure may represent:: 2

• Quantity: total linear stopping power
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance; -dE/dx.
  Reference: [I31-10, 10-18.a]
  


• Quantity: linear energy transfer
  Definition: For an ionizing charged particle, the energy imparted locally to matter in traversing a small distance through the matter, divided by that distance.1 J/m = 1 (m · kg)/s².
  Reference: [I31-10, 10-54.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_MOLE

EDCS Unit Code: 107

Symbol: J/mol

Number of quantities which this unit of measure may represent:: 2

• Quantity: molar thermodynamic energy
  Definition: The thermodynamic energy divided by the amount of substance.1 J/mol = 1 (m² · kg)/(s² · mol).
  Reference: [I31-8, 8-7.a]
  


• Quantity: chemical potential
  Definition: A partial molar Gibbs free energy; the change in Gibbs free energy when one mole of a substance is added to a very large amount of a sample.
  Reference: [I31-8, 8-17.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_PER_SQ_METRE

EDCS Unit Code: 108

Symbol: J/m²

Number of quantities which this unit of measure may represent:: 2

• Quantity: radiant energy fluence
  Definition: At a given point in space, the radiant flux incident on a small sphere, divided by the cross-sectional area of that sphere.1 J/m² = 1 kg/s².
  Reference: [I31-6, 6-11.a]
  


• Quantity: energy fluence
  Definition: At a given point in space, the sum of the energies, exclusive of rest energy, of all the particles incident on a small sphere, divided by the cross-sectional area of that sphere.
  Reference: [I31-10, 10-10.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_JOULE_SECOND

EDCS Unit Code: 109

Symbol: J · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: Planck constant
  Definition: 1 J · s = 1 (m² · kg)/s.
  Reference: [I31-9, 9-7.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KELVIN

EDCS Unit Code: 110

Symbol: K

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermodynamic temperature
  Definition: The fraction 1 / 273,16 of the thermodynamic temperature of the triple point of water.SI base unit.
  Reference: [I31-0, Table 1],[I31-4, 4-1.a],[I31-13, 13-12.a],[I31-13, 13-29.a],[I31-13, 13-36.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KELVIN_PER_KM

EDCS Unit Code: 111

Symbol: K/km

Number of quantities which this unit of measure may represent:: 1

• Quantity: lineic thermodynamic temperature gradient
  Definition: The thermodynamic temperature difference divided by distance.1 K/km = 10^-3 K/m (exactly).
  Reference: [I31-0, 2.3.2.2 (derived),I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KELVIN_PER_METRE

EDCS Unit Code: 112

Symbol: K/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: lineic thermodynamic temperature gradient
  Definition: The thermodynamic temperature difference divided by distance.
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KELVIN_PER_SEC

EDCS Unit Code: 113

Symbol: K/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermodynamic temperature change rate
  Definition: The thermodynamic temperature change over an interval of time, divided by that time.
  Reference: [I31-0, 2.3.2.2 and 2.3.4 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KELVIN_PER_WATT

EDCS Unit Code: 114

Symbol: K/W

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermal resistance
  Definition: The temperature difference divided by heat flow rate.1 K/W = 1 (m² · kg · K)/s³.
  Reference: [I31-4, 4-12.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_METRE_PER_SEC

EDCS Unit Code: 115

Symbol: kg · m/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: momentum
  Definition: The product of mass and velocity.
  Reference: [I31-3, 3-8.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_METRE_SQD

EDCS Unit Code: 116

Symbol: kg · m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: moment of inertia (about an axis)
  Definition: The sum (integral) of the products of the elements of mass of a body and the squares of their distances from an axis.
  Reference: [I31-3, 3-7.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_METRE_SQD_PER_SEC

EDCS Unit Code: 117

Symbol: (kg · m²)/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: moment of momentum (angular momentum)
  Definition: The moment of momentum of a particle about a point is equal to the vector product of the radius vector from this point to the particle and the momentum of the particle.
  Reference: [I31-3, 3-11.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_CUBIC_METRE

EDCS Unit Code: 118

Symbol: kg/m³

Number of quantities which this unit of measure may represent:: 2

• Quantity: volumic mass (mass density)
  Definition: The mass divided by the volume.
  Reference: [I31-3, 3-2.a],[I31-7, 7-8.a]
  


• Quantity: mass concentration (of B)
  Definition: The amount of substance of B divided by the volume of the mixture.
  Reference: [I31-8, 8-11.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_KG

EDCS Unit Code: 119

Symbol: kg/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture. of the mixture.1 kg/kg = 1.
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_LITRE

EDCS Unit Code: 120

Symbol: kg/l

Number of quantities which this unit of measure may represent:: 2

• Quantity: volumic mass (mass density)
  Definition: The mass divided by the volume.1 kg/l = 10^-3 kg/m³ (exactly).
  Reference: [I31-3, 3-2.c]
  


• Quantity: mass concentration (of B)
  Definition: The amount of substance of B divided by the volume of the mixture.
  Reference: [I31-8, 8-11.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_METRE

EDCS Unit Code: 121

Symbol: kg/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: lineic mass (linear density)
  Definition: The mass divided by length.
  Reference: [I31-3, 3-5.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_MOLE

EDCS Unit Code: 122

Symbol: kg/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar mass
  Definition: The mass divided by the amount of substance.
  Reference: [I31-8, 8-5.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_SECOND

EDCS Unit Code: 123

Symbol: kg/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass flow rate
  Definition: The mass of matter which crosses a given surface, divided by time.
  Reference: [I31-3, 3-29.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KG_PER_SQ_METRE

EDCS Unit Code: 124

Symbol: kg/m²

Number of quantities which this unit of measure may represent:: 2

• Quantity: mean mass range
  Definition: The mean linear range multiplied by the volumic mass of the substance.
  Reference: [I31-10, 10-22.a]
  


• Quantity: areic mass (surface density)
  Definition: The mass divided by area.
  Reference: [I31-3, 3-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KILOGRAM

EDCS Unit Code: 125

Symbol: kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: The mass of the international prototype of the kilogram.SI base unit.
  Reference: [I31-0, Table 1],[I31-3, 3-1.a],[I31-8, 8-31.a],[I31-9, 9-4.a],[I31-9, 9-5.a],[I31-9, 9-28.a],[I31-13, 13-31.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KILOPOUND

EDCS Unit Code: 126

Symbol: kp

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: 1 kip = 453,592 37 kg (exactly).
  Reference: [I31-3, 3-1.B.a],[I31-0, 2.3.2.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_KM_PER_HOUR

EDCS Unit Code: 127

Symbol: km/h

Number of quantities which this unit of measure may represent:: 1

• Quantity: velocity
  Definition: The distance divided by time.1 km/h = 1 / 3,6 m/s (exactly).
  Reference: [I31-1, 1-10.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_KNOT

EDCS Unit Code: 128

Symbol: kn

Number of quantities which this unit of measure may represent:: 1

• Quantity: velocity
  Definition: The distance divided by time.1 kn = 1 nautical mile per hour = 1,852 km/h = 0,514 444 m/s (exactly).
  Reference: [I31-1, 1-10.b (remarks)],[I1000, Annex A 1-10]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_LIGHT_YEAR

EDCS Unit Code: 129

Symbol: l.y.

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: The distance travelled in 1 year by electromagnetic waves in free space.1 l.y. = 9,460 730 x 10¹⁵ m (exactly).
  Reference: [I31-1, 1-3.B.a]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_LITRE

EDCS Unit Code: 130

Symbol: l, L(Both symbols are equally accepted.)

Number of quantities which this unit of measure may represent:: 1

• Quantity: volume
  Definition: The product of length, width and height.1 l = 1 dm³ = 10^-3 m³ (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-6.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LITRE_PER_HOUR

EDCS Unit Code: 131

Symbol: L/h

Number of quantities which this unit of measure may represent:: 1

• Quantity: volume flow rate
  Definition: The volume of matter which crosses a given surface, divided by time.1 L/h = 1 / 3,6 x 10^-6 m³/s (exactly).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LITRE_PER_SECOND

EDCS Unit Code: 132

Symbol: L/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: volume flow rate
  Definition: The volume of matter which crosses a given surface, divided by time.1 L/s = 10^-3 m³/s (exactly).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LONG_TON

EDCS Unit Code: 133

Symbol: ton (long)

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: 1 long ton (US) = 1 ton (UK) = 1 016,047 kg (exactly).
  Reference: [I31-3, 3-1.B.e]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_LUMEN

EDCS Unit Code: 134

Symbol: lm

Number of quantities which this unit of measure may represent:: 1

• Quantity: luminous flux
  Definition: The rate of light emission.1 lm = 1 cd · sr.
  Reference: [I31-0, Table 2],[I31-6, 6-30.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUMEN_HOUR

EDCS Unit Code: 135

Symbol: lm · h

Number of quantities which this unit of measure may represent:: 1

• Quantity: quantity of light
  Definition: The time integral of luminous flux.1 lm · h = 3 600 lm · s (exactly).
  Reference: [I31-6, 6-31.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUMEN_PER_SQ_METRE

EDCS Unit Code: 136

Symbol: lm/m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: luminous exitance
  Definition: At a point on a surface, the luminous flux leaving an element of the surface, divided by the area of that element.
  Reference: [I31-6, 6-33.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUMEN_PER_WATT

EDCS Unit Code: 137

Symbol: lm/W

Number of quantities which this unit of measure may represent:: 1

• Quantity: luminous efficacy
  Definition: The luminous flux divided by power (radiant flux).1 lm/W = 1 (s³ · lm)/(m² · kg).
  Reference: [I31-6, 6-36.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUMEN_SECOND

EDCS Unit Code: 138

Symbol: lm · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: quantity of light
  Definition: The time integral of luminous flux.
  Reference: [I31-6, 6-31.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUX

EDCS Unit Code: 139

Symbol: lx

Number of quantities which this unit of measure may represent:: 1

• Quantity: illuminance
  Definition: At a point on a surface, the luminous flux incident on an element of the surface, divided by the area of that element.1 lx = 1 lm/m².
  Reference: [I31-0, Table 2],[I31-6, 6-34.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUX_HOUR

EDCS Unit Code: 140

Symbol: lx · h

Number of quantities which this unit of measure may represent:: 1

• Quantity: light exposure
  Definition: The time integral of illuminance.1 lx · h = 3 600 lx · s (exactly).
  Reference: [I31-6, 6-35.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_LUX_SECOND

EDCS Unit Code: 141

Symbol: lx · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: light exposure
  Definition: The time integral of illuminance.
  Reference: [I31-6, 6-35.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE

EDCS Unit Code: 142

Symbol: m

Number of quantities which this unit of measure may represent:: 22

• Quantity: diffusion length
  Definition: The mean distance that a particle travels before it is absorbed or recombines.
  Reference: [I31-13, 13-34.a]
  


• Quantity: mean free path
  Definition: The average distance traveled by a particle between collisions with another particle in the system.
  Reference: [I31-13, 13-16.a]
  


• Quantity: Compton wavelength
  Definition: The wavelength associated with the mass of any particle.
  Reference: [I31-9, 9-27.a]
  


• Quantity: electron radius
  Definition: The classical theoretical radius of an electron, 2,82 x 10^-15 m, obtained by equating the rest mass energy of an electron to the coulomb energy.
  Reference: [I31-9, 9-26.a]
  


• Quantity: Bohr radius
  Definition: The radius of the electron orbit having the lowest energy in the Bohr atom; 0,5292 x 10^-10 m.
  Reference: [I31-9, 9-8.a]
  


• Quantity: mean linear range
  Definition: The distance that a particle penetrates in a given substance under specified conditions averaged over a group of particles having the same initial energy.
  Reference: [I31-10, 10-21.a]
  


• Quantity: nuclear radius
  Definition: The average radius of the volume in which the nuclear matter is included.
  Reference: [I31-9, 9-17.a]
  


• Quantity: mean free path
  Definition: The average distance that particles travel between two successive specified reactions or processes.
  Reference: [I31-10, 10-39.a]
  


• Quantity: fundamental lattice vector
  Definition: The fundamental translation vectors for the crystal lattice.
  Reference: [I31-13, 13-1.a]
  


• Quantity: slowing-down length
  Definition: The square root of the slowing-down area.
  Reference: [I31-10, 10-41.a]
  


• Quantity: coherence length
  Definition: The distance in a superconductor over which the effect of a perturbation is appreciable.
  Reference: [I31-13, 13-39.a]
  


• Quantity: length
  Definition: The length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second.SI base unit.
  Reference: [I31-0, Table 1],[I31-1, 1-3.a]
  


• Quantity: mean free path
  Definition: For a molecule, the average distance between two successive collisions.
  Reference: [I31-8, 8-38.a]
  


• Quantity: (instantaneous) sound particle displacement
  Definition: Instantaneous displacement of a particle in a medium from what would be its position in the absence of sound waves.
  Reference: [I31-7, 7-10.a]
  


• Quantity: wavelength
  Definition: The distance in the direction of propagation of a periodic wave between two successive points where at a given time the phase is the same.
  Reference: [I31-2, 2-5.a],[I31-6, 6-3.a],[I31-7, 7-5.a]
  


• Quantity: lattice plane spacing
  Definition: The distance between successive lattice planes.
  Reference: [I31-13, 13-3.a]
  


• Quantity: Burgers vector
  Definition: The vector characterizing a dislocation, i.e. the closing vector in a Burgers circuit encircling a dislocation line.
  Reference: [I31-13, 13-7.a]
  


• Quantity: migration length
  Definition: The square root of the migration area.
  Reference: [I31-10, 10-41.a]
  


• Quantity: lattice vector
  Definition: The translation vector which maps the crystal lattice on itself.
  Reference: [I31-13, 13-1.a]
  


• Quantity: focal distance
  Definition: For a single thin lens, the distance from the centre of the lens to the focal point.
  Reference: [I31-6, 6-45.a]
  


• Quantity: half-thickness (half-value thickness)
  Definition: The thickness of the attenuating layer that reduces the current density of a unidirectional beam to one-half of its initial value.
  Reference: [I31-10, 10-17.a]
  


• Quantity: diffusion length
  Definition: The square root of the diffusion area.
  Reference: [I31-10, 10-41.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE_FOURTH_POWER

EDCS Unit Code: 143

Symbol: m⁴

Number of quantities which this unit of measure may represent:: 1

• Quantity: second moment of area (second axial moment of area)
  Definition: The second axial moment of area of a plane area (section) about an axis in its plane is the sum (integral) of the products of its elements of area and the squares of their distances from the axis or point.
  Reference: [I31-3, 3-20.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE_KELVIN

EDCS Unit Code: 144

Symbol: m · K

Number of quantities which this unit of measure may represent:: 1

• Quantity: second radiation constant
  Definition: The constant c₂ in the expression for the spectral concentration of the radiant exitance of a full radiator (black body).
  Reference: [I31-6, 6-20.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE_PER_HOUR

EDCS Unit Code: 145

Symbol: m/h

Number of quantities which this unit of measure may represent:: 1

• Quantity: velocity
  Definition: The distance divided by time.1 m/h = 1 / 3,6 x 10^-3 m/s (exactly).
  Reference: [I31-1, 1-10.a, I31-0, 2.3.2.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE_PER_SEC

EDCS Unit Code: 146

Symbol: m/s

Number of quantities which this unit of measure may represent:: 4

• Quantity: neutron speed
  Definition: The magnitude of the neutron velocity.
  Reference: [I31-10, 10-30.a]
  


• Quantity: phase velocity
  Definition: In wave propagation, the velocity of a surface of constant phase; this would be the speed of the wave.
  Reference: [I31-2, 2-8.a]
  


• Quantity: velocity
  Definition: The distance divided by time.
  Reference: [I31-1, 1-10.a]
  


• Quantity: group velocity
  Definition: The velocity of a packet of waves having different frequencies and phase velocities.
  Reference: [I31-2, 2-8.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_METRE_PER_SEC_SQD

EDCS Unit Code: 147

Symbol: m/s²

Number of quantities which this unit of measure may represent:: 1

• Quantity: acceleration
  Definition: The change in velocity divided by time.
  Reference: [I31-1, 1-11.a],[I31-7, 7-12.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MILE

EDCS Unit Code: 148

Symbol: mile

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: 1 mile = 1 609,344 m (exactly).
  Reference: [I31-1, 1-3.A.d]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_MILE_PER_HOUR

EDCS Unit Code: 149

Symbol: mile/h

Number of quantities which this unit of measure may represent:: 1

• Quantity: velocity
  Definition: The distance divided by time.1 mile/h = 0,447 04 m/s (exactly).
  Reference: [I31-1, 1-10.A.b]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_MINUTE

EDCS Unit Code: 150

Symbol: min

Number of quantities which this unit of measure may represent:: 1

• Quantity: time
  Definition: 1 min = 60 s (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-7.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MINUTE_ARC

EDCS Unit Code: 151

Symbol: '

Number of quantities which this unit of measure may represent:: 1

• Quantity: plane angle
  Definition: The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle.1' = (1 / 60)º = (π / 10 800) rad (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-1.c]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MINUTE_PER_CUBIC_METRE

EDCS Unit Code: 152

Symbol: min/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumetric entity dose (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The time integral of exposure to a number of molecules or particles divided by their volume.1 min/³ = 60 s/m³ (exactly).
  Reference: [I31-8, 8-10.a,I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MOLE

EDCS Unit Code: 153

Symbol: mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: amount of substance
  Definition: The amount of substance in a system which contains as many elementary entities as there are atoms in 0,012 kilogram of carbon 12.When the mole is used, the elementary entities must be specified, and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.SI base unit.
  Reference: [I31-0, Table 1],[I31-8, 8-3.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MOLE_PER_CUBIC_M

EDCS Unit Code: 154

Symbol: mol/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: concentration (amount-of-substance concentration)
  Definition: The amount of substance divided by the volume of the mixture.
  Reference: [I31-8, 8-13.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MOLE_PER_KG

EDCS Unit Code: 155

Symbol: mol/kg

Number of quantities which this unit of measure may represent:: 2

• Quantity: molality of solute
  Definition: The amount of substance of solute in a solution divided by the mass of the solvent.
  Reference: [I31-8, 8-16.a]
  


• Quantity: ionic strength
  Definition: The mass concentration of ions in a solution.
  Reference: [I31-8, 8-46.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MOLE_PER_LITRE

EDCS Unit Code: 156

Symbol: mol/l, mol/L

Number of quantities which this unit of measure may represent:: 1

• Quantity: concentration (amount-of-substance concentration)
  Definition: The amount of substance divided by the volume of the mixture.1 mol/l = 10³ mol/m³ (exactly).
  Reference: [I31-8, 8-13.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_MOLE_PER_MOLE

EDCS Unit Code: 157

Symbol: mol/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: mole fraction (of B)
  Definition: The ratio of the amount of substance of B to the amount of substance of the mixture.1 mol/mol = 1.
  Reference: [I31-8, 8-14.a],[I31-0, 2.3.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NAUTICAL_MILE

EDCS Unit Code: 158

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: 1 nautical mile = 1 852 m (exactly).
  Reference: [I31-1, 1-3.a (remarks)]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_NEPER

EDCS Unit Code: 159

Symbol: Np

Number of quantities which this unit of measure may represent:: 3

• Quantity: field quantity ratio (level difference)
  Definition: Twice the natural logarithm of a field quantity ratio.1 Np is the level of a field quantity when ln (F/F₀) = 1 where F and F₀ represent two amplitudes of the same kind, F₀ being a reference amplitude.
  Reference: [I31-2, 2-9.a]
  


• Quantity: power quantity ratio (level difference)
  Definition: The natural logarithm of a power quantity ratio.1 Np is the level of a power quantity when 1/2 ln (P/P₀) = 1 where P and P₀ represent two powers of the same kind, P₀ being a reference power.
  Reference: [I31-2, 2-10.a]
  


• Quantity: logarithmic decrement
  Definition: The product of damping coefficient and period.
  Reference: [I31-2, 2-12.a],[I31-7, 7-25.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEPER_PER_SECOND

EDCS Unit Code: 160

Symbol: Np/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: damping coefficient
  Definition: The factor defining the rate of exponential applitude decay in a periodic or acoustic system.
  Reference: [I31-2, 2-11.b],[I31-7, 7-23.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON

EDCS Unit Code: 161

Symbol: N

Number of quantities which this unit of measure may represent:: 1

• Quantity: force
  Definition: An external agent that causes a change in the motion of a free body, or that causes stress in a fixed body; proportional to the rate of change in momentum.1 N = 1 (m · kg)/s².
  Reference: [I31-0, Table 2],[I31-3, 3-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_M_SQD_PER_KG_SQD

EDCS Unit Code: 162

Symbol: (N · m²)/kg²

Number of quantities which this unit of measure may represent:: 1

• Quantity: gravitational force between two particles
  Definition: The force of attraction between massive bodies due to gravitation.1 N · m²/kg² = 1 m³/(kg · s²).
  Reference: [I31-3, 3-14.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_METRE

EDCS Unit Code: 163

Symbol: N · m

Number of quantities which this unit of measure may represent:: 1

• Quantity: moment of force
  Definition: Torque, the tendency of a force to cause an object to rotate about a given point.1 N · m = 1 (m² · kg²)/s².
  Reference: [I31-3, 3-12.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_METRE_SECOND

EDCS Unit Code: 164

Symbol: N · m · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: angular impulse
  Definition: The integral over time of all torques applied.1 N · m · s = 1 (m² · kg²)/s.
  Reference: [I31-3, 3-13.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_PER_METRE

EDCS Unit Code: 165

Symbol: N/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: surface tension
  Definition: The stretching force required to form a liquid film, tending to minimize the area of a surface; equal to the surface energy of the liquid per unit length of the film at equilibrium.1 N/m = 1 kg/s².
  Reference: [I31-3, 3-25.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_PER_SQ_M

EDCS Unit Code: 166

Symbol: N/m²

Number of quantities which this unit of measure may represent:: 8

• Quantity: instantaneous sound pressure
  Definition: The difference between the instantaneous total pressure and the static pressure.
  Reference: [I31-7, 7-9.a]
  


• Quantity: static pressure
  Definition: The pressure that would exist in the absence of sound waves.
  Reference: [I31-7, 7-9.a]
  


• Quantity: pressure
  Definition: The force divided by the area over which it is applied.
  Reference: [I31-3, 3-15.a]
  


• Quantity: pressure
  Definition: The force that is exerted per unit area.1 N/m² = 1 Pa = 1 kg/(m · s²).
  Reference: [I31-0, Table 2]
  


• Quantity: modulus of elasticity
  Definition: The stress per unit elastic strain, expressed as a ratio between the stress placed on a material and the strain, or dimensional response to stress.
  Reference: [I31-3, 3-18.a]
  


• Quantity: partial pressure (of B, in a gaseous mixture)
  Definition: For a gaseous mixture, p_B = x_B·p, where p is the pressure.
  Reference: [I31-8, 8-19.a]
  


• Quantity: fugacity (in a gaseous mixture)
  Definition: A function substituting for pressure, allowing a real gas system to be considered by the same equations that apply to an ideal gas.
  Reference: [I31-8, 8-20.a]
  


• Quantity: osmotic pressure
  Definition: The excess pressure required to maintain osmotic equilibrium between a solution and the pure solvent separated by a membrane permeable only to the solvent.
  Reference: [I31-8, 8-26.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_SECOND

EDCS Unit Code: 167

Symbol: N · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: impulse
  Definition: A vector quantity given by the integral over time of the force acting on a body, usually in a collision in which the time interval is very brief; it is equal to the change in the momentum of the body.1 N · s = 1 (m · kg)/s.
  Reference: [I31-3, 3-10.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_NEWTON_SECOND_PER_METRE

EDCS Unit Code: 168

Symbol: (N · s)/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: mechanical impedance
  Definition: At a surface (or at a point), the complex representation of total force divided by the complex representation of average particle velocity at that surface (or of particle velocity at that point) in the direction of the force.1 (N · s)/m = 1 kg/s.
  Reference: [I31-7, 7-19.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_OCTAVE

EDCS Unit Code: 169

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: frequency interval
  Definition: The numerical value of a frequency interval in octaves is given by lb (f₂/f₁), when f₂ is greater than f₁.
  Reference: [I31-7, 7-3.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_OHM

EDCS Unit Code: 170

Symbol: Ω

Number of quantities which this unit of measure may represent:: 1

• Quantity: electrical resistance
  Definition: The electric potential difference divided by current when there is no electromotive force in the conductor.1 Ω = 1 V/A = 1 (m² · kg)/(s³ · A²).
  Reference: [I31-0, Table 2],[I31-5, 5-33.a],[I31-5, 5-44.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_OHM_METRE

EDCS Unit Code: 171

Symbol: Ω · m

Number of quantities which this unit of measure may represent:: 2

• Quantity: residual resistivity
  Definition: For metals, the resistivity extrapolated to zero thermodynamic temperature.
  Reference: [I31-13, 13-18.a]
  


• Quantity: resistivity
  Definition: The inherent ability of a material to resist current flow.1 Ω · m = 1 (m³ · kg)/(s³ · A²).
  Reference: [I31-5, 5-36.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PARSEC

EDCS Unit Code: 172

Symbol: pc

Number of quantities which this unit of measure may represent:: 1

• Quantity: length
  Definition: The distance at which 1 astronomical unit subtends an angle of 1 second of arc.1 pc = 206 264,8 AU = 30,856 78 x 10¹⁵ m (exactly).
  Reference: [I31-1, 1-3.B.c]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_PASCAL

EDCS Unit Code: 173

Symbol: Pa

Number of quantities which this unit of measure may represent:: 8

• Quantity: pressure
  Definition: The force divided by the area over which it is applied.
  Reference: [I31-3, 3-18.a]
  


• Quantity: modulus of elasticity
  Definition: The stress per unit elastic strain, expressed as a ratio between the stress placed on a material and the strain, or dimensional response to stress.
  Reference: [I31-7, 7-9.a]
  


• Quantity: instantaneous sound pressure
  Definition: Difference between the instantaneous total pressure and the static pressure.
  Reference: [I31-7, 7-9.a]
  


• Quantity: partial pressure (of B, in a gaseous mixture)
  Definition: For a gaseous mixture, p_B = x_B·p, where p is the pressure.
  Reference: [I31-8, 8-19.a]
  


• Quantity: fugacity (in a gaseous mixture)
  Definition: A function substituting for pressure, allowing a real gas system to be considered by the same equations that apply to an ideal gas.
  Reference: [I31-8, 8-20.a]
  


• Quantity: static pressure
  Definition: The pressure that would exist in the absence of sound waves.
  Reference: [I31-7, 7-9.a]
  


• Quantity: osmotic pressure
  Definition: The excess pressure required to maintain osmotic equilibrium between a solution and the pure solvent separated by a membrane permeable only to the solvent.
  Reference: [I31-8, 8-26.a]
  


• Quantity: pressure
  Definition: The force that is exerted per unit area.1 Pa = 1 N/m² = 1 kg/(m · s²).
  Reference: [I31-0, Table 2],[I31-3, 3-15.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PASCAL_PER_KELVIN

EDCS Unit Code: 174

Symbol: Pa/K

Number of quantities which this unit of measure may represent:: 1

• Quantity: pressure coefficient
  Definition: The fractional change in the pressure of a gas sample divided by the fractional change in the temperature under specified conditions, such as constant volume.1 Pa/K = 1 kg/(m · s² · K).
  Reference: [I31-4, 4-4.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PASCAL_PER_SEC

EDCS Unit Code: 175

Symbol: Pa/s

Number of quantities which this unit of measure may represent:: 1

• Quantity: pressure change rate
  Definition: The rate of change in force is exerted per unit area.1 Pa/s = 1 kg/(m · s³).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PASCAL_SEC

EDCS Unit Code: 176

Symbol: Pa · s

Number of quantities which this unit of measure may represent:: 1

• Quantity: dynamic viscosity
  Definition: The constant of proportionality of the rate of deformation of a Newtonian fluid, directly proportional to the applied shear stress.1 Pa · s = 1 kg/(m · s).
  Reference: [I31-3, 3-23.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PASCAL_SEC_PER_CUBIC_METRE

EDCS Unit Code: 177

Symbol: (Pa · s)/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: acoustic impedance
  Definition: At a surface, the complex representation of sound pressure divided by the complex representation of volume flow rate.1 (Pa · s)/m³ = 1 kg/(m⁴ · s).
  Reference: [I31-7, 7-18.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PASCAL_SEC_PER_METRE

EDCS Unit Code: 178

Symbol: (Pa · s)/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: characteristic impedance of a medium
  Definition: At a point in a medium and for a plane progressive wave, the complex representation of sound pressure divided by the complex representation of particle velocity.1 (Pa · s)/m = 1 kg/(m² · s).
  Reference: [I31-7, 7-20.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PERCENT

EDCS Unit Code: 179

Symbol: %

Number of quantities which this unit of measure may represent:: 1

• Quantity: special (pure number)
  Definition: 1% = 0,01 x 1 (often omitted).
  Reference: [I31-0, 2.3.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_PHON

EDCS Unit Code: 180

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: loudness level
  Definition: 1 phon is the loudness level when 2 lb (p_eff/p₀)_{1 kHz} = 0,1 , where p_eff is the root-mean-square value of the sound pressure of a pure tone of 1 kHz, which is judged by a normal observer under standardized listening conditions as being as loud as the sound under investigation, and where p₀ = 20 μPa.
  Reference: [I31-7, 7-31.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_PPB_MASS_FRACTION

EDCS Unit Code: 181

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 x 10^-9 kg/kg (exactly).
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_PPM_MASS_FRACTION

EDCS Unit Code: 182

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 x 10^-6 kg/kg (exactly).
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_PPT_MASS_FRACTION

EDCS Unit Code: 183

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 x 10^-12 kg/kg (exactly).
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_PPTH_MASS_FRACTION

EDCS Unit Code: 184

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass fraction (of B)
  Definition: The mass of B divided by the mass of the mixture.1 x 10^-3 kg/kg (exactly).
  Reference: [I31-8, 8-12.a],[I31-0, 2.3.3]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_RAD

EDCS Unit Code: 185

Symbol: rd

Number of quantities which this unit of measure may represent:: 1

• Quantity: absorbed dose of ionizing radiation
  Definition: For any ionizing radiation, the energy imparted to an element of irradiated matter divided by the mass of this element.1 rad = 1 cGy = 10^-2 Gy (exactly).
  Reference: [I31-10, 10-51.a (remarks)],[I1000, Annex A 10-51.2]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_RADIAN

EDCS Unit Code: 186

Symbol: rad

Number of quantities which this unit of measure may represent:: 3

• Quantity: phase difference
  Definition: The relative angular displacement between a periodic quantity and a reference angle or between two sinusoidally varying quantities of identical frequencies.
  Reference: [I31-5, 5-43.a]
  


• Quantity: plane angle
  Definition: The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle.1 rad = 1 m/m = 1A complete angle (full circle) is 2π rad.
  Reference: [I31-0, Table 2],[I31-1, 1-1.a]
  


• Quantity: angle of optical rotation
  Definition: Angle through which plane-polarized light is rotated clockwise, as seen when facing the light source, in passing through an optically active medium.
  Reference: [I31-8, 8-51.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_RADIAN_PER_METRE

EDCS Unit Code: 187

Symbol: rad/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: angular repetency (angular wave number)
  Definition: The reciprocal of the wavelength or the number of waves per unit angle along the direction of propagation.
  Reference: [I31-2, 2-7.a],[I31-6, 6-5.a],[I31-7, 7-7.a],[I31-13, 13-10.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_RADIAN_PER_SEC

EDCS Unit Code: 188

Symbol: rad/s

Number of quantities which this unit of measure may represent:: 4

• Quantity: pulsatance
  Definition: The angular velocity of a periodic quantity.
  Reference: [I31-2, 2-4.a],[I31-5, 5-42.a],[I31-7, 7-4.a]
  


• Quantity: angular frequency
  Definition: The number of cycles or revolutions divided by time.
  Reference: [I31-6, 6-2.a],[I31-9, 9-14.a],[I31-9, 9-15.a],[I31-13, 13-11.a]
  


• Quantity: angular frequency
  Definition: The frequency of rotation or vibration.
  Reference: [I31-2, 2-4.a],[I31-5, 5-42.a],[I31-7, 7-4.a]
  


• Quantity: angular velocity
  Definition: The change in angular position divided by time.
  Reference: [I31-1, 1-8.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_RADIAN_PER_SEC_SQD

EDCS Unit Code: 189

Symbol: rad/s²

Number of quantities which this unit of measure may represent:: 1

• Quantity: angular acceleration
  Definition: The change in angular velocity divided by time.
  Reference: [I31-1, 1-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_REM

EDCS Unit Code: 190

Symbol: rem

Number of quantities which this unit of measure may represent:: 1

• Quantity: dose equivalent of ionizing radiation
  Definition: The product of D, Q and N, at the point of interest in tissue, where D is the absorbed dose, Q is the quality factor and N is the product of any other modifying factors.1 rem = 1 cSv = 10^-2 Sv (exactly).
  Reference: [I31-10, 10-52.a (remarks)],[I1000, Annex A 10-52]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_ROENTGEN

EDCS Unit Code: 191

Symbol: R

Number of quantities which this unit of measure may represent:: 1

• Quantity: exposure of ionizing radiation
  Definition: The total electric charge of the ions of the same sign produced when all the electrons (negative and positive) liberated by photons in an element of air are stopped in air, divided by the mass of that element.1 R = 2,58 x 10⁴ C/kg (exactly).
  Reference: [I31-10, 10-58.a (remarks)],[I1000, Annex A 10-58]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_SECOND

EDCS Unit Code: 192

Symbol: s

Number of quantities which this unit of measure may represent:: 10

• Quantity: time constant (relaxation time)
  Definition: The reciprocal of the damping coefficient.
  Reference: [I31-7, 7-24.a]
  


• Quantity: mean life
  Definition: The average amount of time an unstable radioisotope exists before it decays, equal to the reciprocal of the decay constant.
  Reference: [I31-9, 9-31.a]
  


• Quantity: time constant of an exponentially varying quantity
  Definition: The time after which the quantity would reach its limit if it maintained its initial rate of variation.
  Reference: [I31-2, 2-2.a]
  


• Quantity: half-life
  Definition: The average time required for the decay of one half of the atoms of a sample of a radioactive nuclide.
  Reference: [I31-9, 9-37.a]
  


• Quantity: reverberation time
  Definition: The time required for the average sound energy density in an enclosure to decrease to 10^-6 of its initial value (i.e., by 60 dB) after the source has stopped.
  Reference: [I31-7, 7-30.a]
  


• Quantity: carrier life time
  Definition: The time constant for recombination or trapping of minority charge carriers in semiconductors.
  Reference: [I31-13, 13-33.a]
  


• Quantity: relaxation time
  Definition: The time constant for exponential decay towards equilibrium.
  Reference: [I31-13, 13-33.a]
  


• Quantity: period (periodic time)
  Definition: The time of one cycle.
  Reference: [I31-2, 2-1.a],[I31-7, 7-1.a]
  


• Quantity: reactor time constant
  Definition: The time required for the neutron fluence rate in a reactor to change by the factor e when the fluence rate is rising or falling exponentially.
  Reference: [I31-10, 10-48.a]
  


• Quantity: time
  Definition: The duration of 9 192 631 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom.SI base unit.
  Reference: [I31-0, Table 1],[I31-1, 1-7.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SECOND_ARC

EDCS Unit Code: 193

Symbol: "

Number of quantities which this unit of measure may represent:: 1

• Quantity: plane angle
  Definition: The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle.1" = (1 / 3 600)º = (π / 648 000) rad (exactly).
  Reference: [I31-0, Table 4],[I31-1, 1-1.d]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SECOND_PER_CUBIC_M_RADIAN

EDCS Unit Code: 194

Symbol: s/(m³ · rad)

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral concentration of vibrational modes (in terms of angular frequency)
  Definition: The number of vibrational modes in an infinitesimal interval of angular frequency, divided by the size of that interval and by volume.1 s/(m³ · rad) = 1 s/m³ (exactly).
  Reference: [I31-13, 13-13.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SECOND_PER_CUBIC_METRE

EDCS Unit Code: 195

Symbol: s/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumetric entity dose (any elementary entity: atoms, molecules, ions, electrons, other particles, or specified groups of such particles)
  Definition: The time integral of exposure to a number of molecules or particles divided by their volume.
  Reference: [I31-8, 8-10.a,I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SIEMENS

EDCS Unit Code: 196

Symbol: S

Number of quantities which this unit of measure may represent:: 2

• Quantity: admittance
  Definition: The reciprocal of the complex representation of potential difference divided by the complex representation of current; the reciprocal of impedance.
  Reference: [I31-5, 5-45.a]
  


• Quantity: electrical conductance
  Definition: The electric current divided by potential difference when there is no electromotive force in the conductor; the reciprocal of electrical resistance.1 S = 1 Ω^-1 = 1 (s³ · A²)/(m² · kg).
  Reference: [I31-0, Table 2],[I31-5, 5-34.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SIEMENS_M_SQD_PER_MOLE

EDCS Unit Code: 197

Symbol: (S · m²)/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar conductivity
  Definition: The conductivity divided by the amount-of-substance concentration.1 (S · m²)/mol = 1 (s³ · A²)/(kg · mol).
  Reference: [I31-8, 8-49.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SIEMENS_PER_METRE

EDCS Unit Code: 198

Symbol: S/m

Number of quantities which this unit of measure may represent:: 2

• Quantity: electrical conductivity
  Definition: The electric current density divided by the electric field strength.1 S/m = 1 (s³ · A²)/(m³ · kg).
  Reference: [I31-5, 5-37.a]
  


• Quantity: electrolytic conductivity
  Definition: The electrolytic current density divided by the electric field strength.
  Reference: [I31-8, 8-48.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SIEVERT

EDCS Unit Code: 199

Symbol: Sv

Number of quantities which this unit of measure may represent:: 1

• Quantity: dose equivalent of ionizing radiation
  Definition: The product of D, Q and N, at the point of interest in tissue, where D is the absorbed dose, Q is the quality factor and N is the product of any other modifying factors.1 Sv = 1 J/kg = 1 m²/s².
  Reference: [I31-0, Table 3],[I31-10, 10-52.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SONE

EDCS Unit Code: 200

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: loudness
  Definition: A normal observer's auditory estimate of the ratio between the strength of the sound considered and that of a reference sound having a loudness level of 40 phons.
  Reference: [I31-7, 7-32.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE

EDCS Unit Code: 201

Symbol: m²

Number of quantities which this unit of measure may represent:: 1

• Quantity: area
  Definition: The product of length and width.
  Reference: [I31-1, 1-5.a],[I31-7, 7-29.a],[I31-9, 9-16.a],[I31-10, 10-3.a],[I31-10, 10-16.a],[I31-10, 10-40.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_AMP_PER_JOULE_SEC

EDCS Unit Code: 202

Symbol: (m² · A)/(J · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: gyromagnetic coefficient (gyromagnetic ratio)
  Definition: The ratio of the magnetic moment to the intrinsic angular momentum of a spinning particle.1 (m² · A)/(J · s) = 1 (s · A)/kg.
  Reference: [I31-9, 9-12.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_AMPERE

EDCS Unit Code: 203

Symbol: m² · A

Number of quantities which this unit of measure may represent:: 2

• Quantity: magnetic moment (electromagnetic moment)
  Definition: A vector quantity, the vector product of which with the magnetic flux density of a homogeneous field is equal to the torque.
  Reference: [I31-5, 5-27.a]
  


• Quantity: magnetic moment of particle or nucleus
  Definition: Expectation value of the component of the electromagnetic moment in the direction of the magnetic field in the quantum state with maximum magnetic quantum number.
  Reference: [I31-9, 9-11.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_KELVIN_PER_WATT

EDCS Unit Code: 204

Symbol: (m² · K)/W

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermal insulance (coefficient of thermal insulation)
  Definition: The temperature difference divided by areic heat flow rate.1 (m² · K)/W = 1 (s³ · K)/kg.
  Reference: [I31-4, 4-11.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_JOULE

EDCS Unit Code: 205

Symbol: m²/J

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral cross-section
  Definition: Cross-section for a process in which the energy of the ejected or scattered particle is in an element of energy, divided by this element.1 m²/J = 1 s²/kg.
  Reference: [I31-10, 10-5.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_JOULE_SR

EDCS Unit Code: 206

Symbol: m²/(J · sr)

Number of quantities which this unit of measure may represent:: 1

• Quantity: spectral angular cross-section
  Definition: Cross-section for ejecting or scattering a particle into an element of solid angle with energy in an element of energy, divided by the product of these two elements.1 m²/(J · sr) = 1 s²/(kg · sr).
  Reference: [I31-10, 10-6.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_KG

EDCS Unit Code: 207

Symbol: m²/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass attenuation coefficient
  Definition: The linear attenuation coefficient divided by the volumic mass of the substance.
  Reference: [I31-10, 10-14.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_MOLE

EDCS Unit Code: 208

Symbol: m²/mol

Number of quantities which this unit of measure may represent:: 2

• Quantity: molar attenuation coefficient
  Definition: The linear attenuation coefficient divided by the amount-of-substance concentration.
  Reference: [I31-10, 10-15.a]
  


• Quantity: molar absorption coefficient
  Definition: The linear attenuation coefficient divided by the volumic amount of the substance.
  Reference: [I31-6, 6-43.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_SECOND

EDCS Unit Code: 209

Symbol: m²/s

Number of quantities which this unit of measure may represent:: 3

• Quantity: kinematic viscosity
  Definition: The absolute viscosity of a fluid divided by its density.
  Reference: [I31-3, 3-24.a]
  


• Quantity: thermal diffusivity
  Definition: The ratio of thermal conductivity to the heat capacity per unit volume for a material.
  Reference: [I31-4, 4-14.a]
  


• Quantity: diffusion coefficient
  Definition: The rate at which atoms or ions diffuse across a surface area per unit time.
  Reference: [I31-8, 8-39.a],[I31-10, 10-32.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_STERADIAN

EDCS Unit Code: 210

Symbol: m²/sr

Number of quantities which this unit of measure may represent:: 1

• Quantity: angular cross-section
  Definition: The cross-section for ejecting or scattering a particle into an element of solid angle, divided by this element.
  Reference: [I31-10, 10-4.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_PER_VOLT_SECOND

EDCS Unit Code: 211

Symbol: m²/(V · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: mobility
  Definition: The average drift velocity imparted to a charged particle in a medium by an electric field, divided by the field strength.1 m²/(V · s) = 1 (s² · A)/kg.
  Reference: [I31-10, 10-26.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_RADIAN_PER_KG

EDCS Unit Code: 212

Symbol: (m² · rad)/kg

Number of quantities which this unit of measure may represent:: 1

• Quantity: massic optical rotatory power (specific optical rotatory power)
  Definition: The cross-sectional area of a linearly polarized light beam times its angle of optical rotation, divided by the mass of the optically active component in the path.
  Reference: [I31-8, 8-53.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_SQ_METRE_RADIAN_PER_MOLE

EDCS Unit Code: 213

Symbol: (m² · rad)/mol

Number of quantities which this unit of measure may represent:: 1

• Quantity: molar optical rotatory power
  Definition: The cross-sectional area of a linearly polarized light beam times its angle of optical rotation, divided by the amount of substance of the optically active component in the path.
  Reference: [I31-8, 8-52.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_STERADIAN

EDCS Unit Code: 214

Symbol: sr

Number of quantities which this unit of measure may represent:: 1

• Quantity: solid angle
  Definition: The solid angle of a cone is defined as the ratio of the area cut out on a spherical surface (with its centre at the apex of that cone) to the square of the radius of the sphere.1 sr = 1 m²/m² = 1A complete angle over all space (full sphere) is 4π sr.
  Reference: [I31-0, Table 2],[I31-1, 1-2.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_TEC

EDCS Unit Code: 215

Symbol: none

Number of quantities which this unit of measure may represent:: 1

• Quantity: total electron count (areal electron density)
  Definition: At a given point in space, the number of electrons incident on a small sphere, divided by the cross-sectional area of that sphere.1 TEC = 10¹⁶ 1/m² (exactly).
  Reference: [I31-6, 6-28.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_TESLA

EDCS Unit Code: 216

Symbol: T

Number of quantities which this unit of measure may represent:: 2

• Quantity: magnetic flux density (magnetic induction)
  Definition: The amount of magnetic flux through a unit area taken perpendicular to the direction of the magnetic flux.1 T = 1 Wb/m² = 1 kg/(s² · A).
  Reference: [I31-0, Table 2],[I31-5, 5-19.a]
  


• Quantity: thermodynamic critical magnetic flux density
  Definition: The critical flux density for disappearance of superconductivity in type I superconductors.
  Reference: [I31-13, 13-37.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_TON

EDCS Unit Code: 217

Symbol: ton

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: 1 ton (US) = 907,184 7 kg (exactly).
  Reference: [I31-3, 3-1.B.e]
  

Deprecated Unit: True.

EDCS Unit Symbolic Constant: EUC_TONNE

EDCS Unit Code: 218

Symbol: t

Number of quantities which this unit of measure may represent:: 1

• Quantity: mass
  Definition: 1 t = 1 000 kg (exactly).
  Reference: [I31-0, Table 4],[I31-3, 3-1.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_TONNE_PER_CUBIC_METRE

EDCS Unit Code: 219

Symbol: t/m³

Number of quantities which this unit of measure may represent:: 1

• Quantity: volumic mass (mass density)
  Definition: The mass divided by the volume.1 t/m³ = 10³ kg/m³ (exactly).
  Reference: [I31-3, 3-2.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_UNIFIED_AMASS_UNIT

EDCS Unit Code: 220

Symbol: u

Number of quantities which this unit of measure may represent:: 1

• Quantity: molecular mass
  Definition: The value of the unified atomic mass unit is determined experimentally and is equal to (1 / 12) of the mass of an atom of the nuclide ¹²C; 1 u = 1,660 540 x 10^-27 kg (approximately).
  Reference: [I31-0, Table 6],[I31-8, 8-31.b],[I31-9, 9-4.b],[I31-9, 9-5.b],[I31-9, 9-28.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_UNITLESS

EDCS Unit Code: 221

Symbol: 1 (often omitted)

Number of quantities which this unit of measure may represent:: 1

• Quantity: special (pure number)
  Definition: 1.
  Reference: [I31-0, 2.3.3]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_VOLT

EDCS Unit Code: 222

Symbol: V

Number of quantities which this unit of measure may represent:: 3

• Quantity: electromotive force
  Definition: The energy supplied by a source divided by the electric charge transported through the source.1 V = 1 W/A = 1 (m² · kg)/(s³ · A).
  Reference: [I31-0, Table 2],[I31-5, 5-6.a]
  


• Quantity: electric potential
  Definition: The potential measured by the energy of a unit positive charge at a point, expressed relative to an equipotential surface, generally the surface of the <EARTH>, that has zero potential.1 V = 1 W/A = 1 (m² · kg)/(s³ · A).
  Reference: [I31-0, Table 2],[I31-5, 5-6.a]
  


• Quantity: Peltier coefficient
  Definition: The Peltier heat power developed at a junction, divided by the electric current flowing from substance A to substance B.
  Reference: [I31-13, 13-23.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_VOLT_AMP

EDCS Unit Code: 223

Symbol: V · A

Number of quantities which this unit of measure may represent:: 1

• Quantity: apparent power
  Definition: In electric power technology, active power is expressed in watts (W), apparent power in volt amperes (V · A) and reactive power in vars (var).1 V · A = 1 (m² · kg)/(s³ · A).
  Reference: [I31-5, 5-50.a],[I1000, Annex A 5-49]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_VOLT_PER_KELVIN

EDCS Unit Code: 224

Symbol: V/K

Number of quantities which this unit of measure may represent:: 2

• Quantity: Seebeck coefficient
  Definition: The thermoelectromotive force between two substances divided by the temperature of their hot junction.1 V/K = 1 (m² · kg)/(s³ · A · K).
  Reference: [I31-13, 13-22.a]
  


• Quantity: Thomson coefficient
  Definition: The Thomson heat power developed divided by the electric current and temperature difference.
  Reference: [I31-13, 13-24.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_VOLT_PER_METRE

EDCS Unit Code: 225

Symbol: V/m

Number of quantities which this unit of measure may represent:: 1

• Quantity: electric field strength
  Definition: The force, exerted by electric field on an electric point charge, divided by the electric charge.1 V/m = 1 N/C = 1 (m · kg)/(s³ · A).
  Reference: [I31-5, 5-5.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_VOLT_SQD_PER_KELVIN_SQD

EDCS Unit Code: 226

Symbol: V²/K²

Number of quantities which this unit of measure may represent:: 1

• Quantity: Lorenz coefficient
  Definition: The thermal conductivity divided by the electrical conductivity and the thermodynamic temperature.1 V²/K² = 1 (m⁴ · kg²)/(s⁶ · A² · K²).
  Reference: [I31-13, 13-19.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT

EDCS Unit Code: 227

Symbol: W

Number of quantities which this unit of measure may represent:: 4

• Quantity: radiant power (radiant energy flux)
  Definition: The power emitted, transferred or received as radiation.
  Reference: [I31-6, 6-10.a]
  


• Quantity: power
  Definition: The rate of energy transfer.1 W = 1 J/s = 1 (m² · kg)/s³.
  Reference: [I31-0, Table 2],[I31-3, 3-27.a],[I31-5, 5-35.a]
  


• Quantity: sound power
  Definition: The power emitted, transferred or received as sound waves.
  Reference: [I31-7, 7-16.a]
  


• Quantity: heat flow rate
  Definition: The rate at which heat crosses a given surface.
  Reference: [I31-4, 4-7.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_HOUR

EDCS Unit Code: 228

Symbol: W · h

Number of quantities which this unit of measure may represent:: 1

• Quantity: electrical active energy
  Definition: The practical unit of energy in electrical systems.1 W · h = 3 600 J (exactly).
  Reference: [I31-5, 5-52.b]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_KELVIN

EDCS Unit Code: 229

Symbol: W/K

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermal conductance
  Definition: The heat flow rate divided by temperature difference; the reciprocal of thermal resistance.1 W/K = 1 (m² · kg)/(s³ · K).
  Reference: [I31-4, 4-13.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_METRE_K

EDCS Unit Code: 230

Symbol: W/(m · K)

Number of quantities which this unit of measure may represent:: 1

• Quantity: thermal conductivity
  Definition: The areic heat flow rate divided by temperature gradient.1 W/(m · K) = 1 (m · kg)/(s³ · K).
  Reference: [I31-4, 4-9.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_CM_SEC

EDCS Unit Code: 231

Symbol: W/(cm² · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: radiant exitance rate
  Definition: At a point on a surface, the radiant energy flux leaving the element of the surface over an interval of time, divided by the area of that element and that time.1 W/(cm² · s) = 10^-4 W/(m² · s) (exactly).
  Reference: [I31-0, 2.3.2.3 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_M_HZ

EDCS Unit Code: 232

Symbol: W/(m² · Hz)

Number of quantities which this unit of measure may represent:: 1

• Quantity: flux density (frequency dependent)
  Definition: The amount of a given type of radiation that crosses a specified area within a specified period.1 W/(m² · Hz) = 1 kg/s².
  Reference: [I31-0, 2.3.1 and 2.3.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_M_K_FOURTH_PWR

EDCS Unit Code: 233

Symbol: W/(m² · K⁴)

Number of quantities which this unit of measure may represent:: 1

• Quantity: Stefan-Boltzmann constant
  Definition: The constant relating the power per unit area emitted by a radiating black body to its thermodynamic temperature.1 W/(m² · K⁴) = 1 kg/(s³ · K⁴).
  Reference: [I31-6, 6-18.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_METRE

EDCS Unit Code: 234

Symbol: W/m²

Number of quantities which this unit of measure may represent:: 7

• Quantity: Poynting vector
  Definition: The vector product of electric field strength and magnetic field strength.
  Reference: [I31-5, 5-31.a]
  


• Quantity: areic heat flow rate (density of heat flow rate)
  Definition: The heat flow rate divided by area.1 W/m² = 1 kg/s³.
  Reference: [I31-4, 4-8.a]
  


• Quantity: radiant exitance
  Definition: At a point on a surface, the radiant energy flux incident on an element of the surface, divided by the area of that element.
  Reference: [I31-6, 6-15.a]
  


• Quantity: radiant energy fluence rate
  Definition: At a given point in space, the radiant flux incident on a small sphere over a short time interval, divided by the cross-sectional area of that sphere and that time.
  Reference: [I31-6, 6-12.a]
  


• Quantity: energy fluence rate (energy flux density)
  Definition: At a given point in space, the sum of the energies, exclusive of rest energy, of all the particles incident on a small sphere in a small time interval, divided by the cross-sectional area of that sphere and by the time interval.
  Reference: [I31-10, 10-11.a]
  


• Quantity: sound intensity
  Definition: For unidirectional sound power, sound power through a surface normal to the direction of propagation divided by the area of the surface.
  Reference: [I31-7, 7-17.a]
  


• Quantity: irradiance
  Definition: At a point on a surface, the radiant energy flux incident on (or leaving) an element of the surface, divided by the area of that element.
  Reference: [I31-6, 6-16.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_METRE_K

EDCS Unit Code: 235

Symbol: W/(m² · K)

Number of quantities which this unit of measure may represent:: 1

• Quantity: coefficient of heat transfer
  Definition: The heat flow rate divided by area.1 W/(m² · K) = 1 kg/(s³ · K).
  Reference: [I31-4, 4-10.a]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_METRE_MICRON

EDCS Unit Code: 236

Symbol: W/(m² · μm)

Number of quantities which this unit of measure may represent:: 1

• Quantity: integrated spectral radiance
  Definition: At a point on a surface and integrated over all directions, the radiant intensity of an element of the surface, divided by the area of the orthogonal projection of this element on a plane perpendicular to the given direction, as a function of radiant wavelength.1 W/(m² · μm) = 1 kg/(s³ · μm).
  Reference: [I31-0, 2.3.2.2 (derived)]
  

Deprecated Unit: False.

EDCS Unit Symbolic Constant: EUC_WATT_PER_SQ_METRE_SEC

EDCS Unit Code: 237

Symbol: W/(m² · s)

Number of quantities which this unit of measure may represent:: 1

• Quantity: radiant exitance rate
  Definition: At a point on a surface, the radiant energy flux leaving the element of the surface over an interval of time, divided by the area of that element and that time.1 W/(m² · s) = 1 kg/s⁴.
  Reference: [I31-0, 2.3.2.2 (derived)]