Resolution-CGPM-21-7

Resolution 7 of the 21st CGPM

The definition of the kilogram

The 21st Conférence Générale des Poids et Mesures,

considering

  • the need to assure the long-term stability of the SI,
  • the intrinsic uncertainty in the long-term stability of the artefact defining the unit of mass, one of the base units of the SI,
  • the consequent uncertainty in the long-term stability of the other three base units of the SI that depend on the kilogram, namely, the ampere, the mole and the candela,
  • the progress already made in a number of different experiments designed to link the unit of mass to fundamental or atomic constants,
  • the desirability of having more than one method of making such a link,

recommends that national laboratories continue their efforts to refine experiments that link the unit of mass to fundamental or atomic constants with a view to a future redefinition of the kilogram.

reference The reader should note that the official version of this Resolution is the French text

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