POSC Specifications Version 3.0 |
Epicentre Standard Values ref_base_si_unit |
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 |