Resolution 1 of the 16th CGPM

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.

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

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