BIPM - Resolution 9 of the 21st CGPM

Resolution 9 of the 21st meeting of the CGPM (1999)

Version française

Other Resolutions
of the 21st CGPM

Summary

Participation at the General Conference

Presentations by CC Presidents at the 24th meeting of the CGPM (2011)

Resolutions of the CGPM

Proceedings of the CGPM

Chain of responsibility

Procedure for a State to become a Member of the BIPM

Procedure for a State or Economy to become an Associate of the General Conference

Evolving Needs for Metrology in Trade, Industry and Society, and the Role of the BIPM

Direct access


	Extension of the International Temperature Scale below 0.65 K		(8)	(10)

The 21st Conférence Générale des Poids et Mesures,

considering that

many important research activities are in progress at temperatures below 0.65 K,

these researches require an accepted temperature scale which closely represents thermodynamic temperatures,

the direct measurement of thermodynamic temperature is often difficult and time-consuming at temperatures below 0.65 K down to a few millikelvin, but at temperatures much lower than this direct measurements once again become feasible,

considerable work has already been accomplished towards the development of a temperature scale for the range from 0.65 K down to 1 mK based on the melting pressure of ³He,

invites the International Committee to prepare a ³He melting pressure equation as a function of thermodynamic temperature to serve as the basis for an extension of the ITS-90 below its present lower limit of 0.65 K.


	Reference:
	Comptes Rendus de la 21^e CGPM (1999), 2001, 332
	Metrologia, 2000, 37(1), 94

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