Resolution 1 of the 16th CGPM (1979)

Kilogram standards

The 16th Conférence Générale des Poids et Mesures (CGPM),


  • that the accuracy of mass measurements rests upon the perfect conservation of kilogram standards, in particular platinum iridium prototype Kilograms,
  • that the transmission of this accuracy to kilogram standards made of other materials such as stainless steels is limited by an insufficient knowledge of the air buoyancy correction,
  • that this air buoyancy correction is usually calculated on the basis of ambient conditions, but there exist significant differences between the formulas used for this calculation among the different laboratories,


  • that laboratories study the effects of ambient conditions upon kilogram standards and the methods for improving their conservation,
  • that laboratories intensify their work aimed at an improved determination of the air buoyancy correction.

DOI : 10.59161/CGPM1979RES1E

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

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