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

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23rd meeting of the CGPM (2007): Presentations by CC Presidents

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	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.