Decisions of the CGPM and the CIPM related to the SI
SI Brochure - Appendix 1
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 below in chronological order, and can be browsed by subject using the left-hand menu.
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Resolutions/Recommendations
Sanction of the international prototypes of the metre and the kilogram
Declaration concerning the definition of the litre
Declaration on the unit of mass and on the definition of weight; conventional value of gn
Definition of the metre by the international Prototype
Definitions of photometric units
Triple point of water; thermodynamic scale with a single fixed point; unit of quantity of heat (joule)
Proposal for establishing a practical system of units of measurement
Writing and printing of unit symbols and of numbers
Definition of the thermodynamic temperature scale
Definition of the standard atmosphere
Definition of the unit of time (second)
Definition of the unit of time (second)
Système International d'Unités
Atomic and molecular frequency standards
Decimal multiples and submultiples of the unit of mass
SI unit of thermodynamic temperature (kelvin)
Definition of the SI unit of thermodynamic temperature (kelvin)
SI unit of luminous intensity (candela)
Abrogation of earlier decisions (micron, new candle)
Système International d'Unités, Rules for application of Resolution 12 of the 11th CGPM (1960)*
International Atomic Time, function of CIPM
SI unit of amount of substance (mole)
Recommended value for the speed of light
Coordinated Universal Time (UTC)
SI units for ionizing radiation: becquerel
SI units for ionizing radiation: gray
SI unit of luminous intensity (candela)
Special name for the SI unit of dose equivalent (sievert)
SI supplementary units (radian and steradian)
On the realization of the definition of the metre
Forthcoming adjustment to the representations of the volt and of the ohm
Representation of the volt by means of the Josephson effect
Representation of the ohm by means of the quantum Hall effect
The International Temperature Scale of 1990
SI prefixes zetta, zepto, yotta and yocto
Elimination of the class of supplementary units in the SI
Special name for the SI derived unit mole per second, the katal, for the expression of catalytic activity
Revision of the practical realization of the definition of the metre
Revision of the Mise en Pratique list of recommended radiations
Clarification of the definition of the kelvin, unit of thermodynamic temperature
Revision of the Mise en pratique list of recommended radiations
Concerning secondary representations of the second
Revision of the Mise en pratique list of recommended radiations
On the revision of the mise en pratique of the definition of the metre and the development of new optical frequency standards
Clarification of the definition of the kelvin, unit of thermodynamic temperature
On the possible redefinition of certain base units of the International System of Units (SI)
Updates to the list of standard frequencies
On the possible future revision of the International System of Units,the SI
Updates to the list of standard frequencies
On the future revision of the International System of Units, the SI
Updates to the list of standard frequencies
On progress towards the possible redefinition of the SI
On the revision of the International System of Units (SI)
On the extension of the range of SI prefixes