Archival and Theoretical Considerations for Isotopic Dependence in the e-H2 Fixed Points

Published

June 1, 2001

Author(s)

F Pavese, Weston L. Tew, A G. Steele

Abstract

We examine these isotopic dependence for the case of the e-H2 triple point (TP), and the two vapor pressure (VP) points of the ITS-90 defined near 33 kPa and 101 kPa. The archival experimental data allows predictions to be made for the shift in the TP temperature based on extrapolations of observations at large concentrations of ^2^H. Similarly, archival hydrogen vapor pressure measurements of pure ^2^H^1^H allow calculation of the dependence on ^2^H concentration in the dilute limit for ideal solutions. These predictions alone, however, are insufficient to establish a consensus prescription for making corrections for isotopic variations in hydrogen gas samples. New experimental work in this area will be required to resolve these issues and remove the associated ambiguities from the ITS, which probably exceed 0.5 mK.

Proceedings Title

International Symposium on Temperature and Thermal Measurements in Industry and Science | 8th || VDE

Volume

8th

Issue

1

Conference Dates

June 1, 2001

Conference Location

Berlin, 1, GE

Conference Title

TEMPMEKO

Pub Type

Conferences

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Keywords

deuterium, equilibrium hydrogen, hydrogen deuteride, hydrogen fixed points, hydrogen isotopes, ITS-90, triple point, vapor pressures of ideal solutions, VSMOW

Citation

Pavese, F. , Tew, W. and Steele, A. (2001), Archival and Theoretical Considerations for Isotopic Dependence in the e-H₂ Fixed Points, International Symposium on Temperature and Thermal Measurements in Industry and Science | 8th || VDE, Berlin, 1, GE, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830740 (Accessed March 13, 2025)