Articlebronze1993

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

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Scientific Measurement and Uncertainty Evaluation Chemical Thermodynamics and Molecular Structure Calibration and Measurement Techniques

Abstract

New thermodynamic calculations have been made of the 3 He 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.

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1990The International Temperature Scale of 1990 (ITS-90)1960The 1958 He4 scale of temperatures. Part 1. Introduction 1979NPL-75: A Low Temperature Gas Thermometry Scale from 2.6 K to 27.1 K 1964The 1962 He3 scale of temperatures. III. Evaluation and status 1991Thermodynamic Basis of the ITS-90 1964The 1962 He3 scale of temperatures. I. New vapor pressure comparisons 1983Helium Vapour Pressure Equations on the EPT-76

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