CGPM definition
Examples of CGPM in a sentence
An exception, adopted by the 16th CGPM (1979, Resolution 6), is that either capital L or lower-case l is allowed for the litre, in order to avoid possible confusion between the numeral 1 (one) and the lower-case letter l (el).
The definitions of the SI units, as decided by the CGPM, represent the highest reference level for measurement traceability to the SI.
The definition of the unit of thermodynamic temperature was given by the 10th CGPM (1954, Resolution 3; CR 79) which selected the triple point of water, TTPW, as a fundamental fixed point and assigned to it the temperature 273.16 K, thereby defining the ▇▇▇▇▇▇.
The 13th CGPM (1967-1968, Resolution 3; CR, 104 and Metrologia, 1968, 4, 43) adopted the name ▇▇▇▇▇▇, symbol K, instead of “degree ▇▇▇▇▇▇”, symbol ºK, for the unit defined in this way.
The 1889 definition of the metre, namely, the length of the international prototype of platinum-iridium, was replaced by the 11th CGPM (1960) using a definition based on the wavelength of the radiation corresponding to a particular transition in krypton 86.
The present definition, which removed both of these constraints, was adopted in Resolution 1 of the 26th CGPM (2018).
Whenever SI units are involved, these standards must refer to the definitions by the CGPM.
This appendix lists those decisions of the CGPM and the CIPM that bear directly upon definitions of the units of the SI, prefixes defined for use as part of the SI, and conventions for the writing of unit symbols and numbers.
The decisions of the CGPM and CIPM are listed in this appendix in strict chronological order, from 1889 to 2018, in order to preserve the continuity with which they were taken.
This definition was modified in 1967 by the 13th CGPM (Resolution 5, see p.