POSC Specifications
Version 3.0
Epicentre Standard Values
ref_base_si_unit

ref_base_si_unit

Standard Instance Values

acronym identifier description source source _content source _reference version status
            ref _version .identifier  
m metre The metre is the length equal to 1 650 763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p10 and 5d5 of the krypton-86 atom. POSC POSC Eleventh CGPM, 1960, Resolution 6 epicentre 2.1 current
kg kilogram The kilogram is the unit of mass (not force); it is equal to the mass of the international prototype of the kilogram. POSC POSC Third CGPM, 1901, Resolution 3 epicentre 2.1 current
s second The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. POSC POSC Thirteenth CGPM, 1967, Resolution 1 epicentre 2.1 current
A ampere The ampere is that constant 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. POSC POSC CIPM, 1946, Resolution 2 approved by the 9th CGPM, 1948 epicentre 2.1 current
K kelvin The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. POSC POSC Thirteenth CGPM, 1967, Resolution 4 epicentre 2.1 current
mol mole The mole is the amount of substance of a system that 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. POSC POSC Fourteenth CGPM, 1971, Resolution 3 epicentre 2.1 current
cd candela The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 X 10**12 hertz and that has a radian intensity in that direction of 1/683 watt per steradian. POSC POSC Sixteenth CGPM, 1979, Resolution 3 epicentre 2.1 current
rad radian The radian is the plane angle between two radii of a circle that cut of, on the circumference, an arc equal in length to the radius. POSC POSC ISO Recommendation R 31, Part 1, Second Edition, December 1965 epicentre 2.1 current
sr steradian The steradian is the solid angle that, having its vertex in the center of a circle, cuts of an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere. POSC POSC ISO Recommendation R 31, Part 1, Second Edition, December 1965 epicentre 2.1 current
B bel A unit of intensity. A bel is the base 10 logarithm of an intensity ratio. POSC POSC Websters New World Dictionary epicentre 2.1 current
byte byte The capacity, in bytes, of a storage device or an information system, is one eighth of the base two logarithm of the number of possible states of the device or system. POSC POSC   epicentre 2.1 current
O octave The number of octaves between two positive values is the base two logarithm of their ratio. POSC POSC   epicentre 2.1 current
scm(0C) standard cubic metres at 0 deg Celsius A unit of standard volume. The number of scm(0C) of a fluid is the volume the fluid will occupy (in cubic metres) when the fluid is reduced to standard conditions of 1 atm., 0 degrees Celsius. POSC POSC   epicentre 2.1 current
scm(15C) standard cubic metres at 15 deg Celsius A unit of standard volume. The number of scm(15C) of a fluid is the volume the fluid will occupy (in cubic metres) when the fluid is reduced to standard conditions of 1 atm., 15 degrees Celsius. POSC POSC   epicentre 2.1 current
gAPI API gamma ray units A unit defined by the American Petroleum Institute for gamma ray log measurements. POSC POSC   epicentre 2.1 current
nAPI API neutron units A unit defined by the American Petroleum Institute for neutron log measurements. POSC POSC   epicentre 2.1 current
Euc euclid A unit to describe unitless quantities such as ratios. POSC POSC   epicentre 2.1 current

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