Thermodynamic Inconsistency of the ITS-90 Below 1,5 K

1 January 1992

journal article
research article
Published by IOP Publishing in Metrologia

Vol. 29 (6) , 415-423
https://doi.org/10.1088/0026-1394/29/6/005

Abstract

New thermodynamic calculations have been made of the He-3 vapour-pressure scale using recently-published thermal and PVT data for the liquid and vapour phases. It is shown that by making reasonable choices of the data for the second and third virial coefficients of the vapour, and for the heat capacity of the liquid, good agreement can be obtained between a calculated vapour-pressure scale and recent experimental observations based on magnetic thermometry. These have revealed deviations of the ITS-90 from thermodynamic temperature of up to 1 mK at 0,65 K.

Keywords

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