Small Corrections to 1989 NIST Constant-Volume Gas Thermometry Data

Published

November 17, 2023

Author(s)

Allan H. Harvey

Abstract

Constant-volume gas thermometry data published in 1989 for the difference between the thermodynamic temperature and the International Practical Temperature Scale of 1968 are corrected in two ways. A refined estimate of the thermal expansivity of the material of the gas bulb, published in 1990, increases the thermodynamic temperature by amounts on the order of 1-3 mK. Better knowledge of the nonideality of helium gas decreases the thermodynamic temperature by amounts on the order of 0.1-0.5 mK. The net effect is a small increase in the thermodynamic temperature derived from the 1989 experiments. The magnitude of this increase is approximately 2 mK at 505 K, increasing to 3 mK at temperatures near 700 K, and then diminishing to near 0.5 mK at the highest temperature of the measurements (933 K). These corrections are smaller than the uncertainty of the experiments, but may be of significance for future recommendations for the relationship between the thermodynamic temperature and the consensus scale in this temperature range.

Citation

Metrologia

Volume

60

Issue

6

Pub Type

Journals

Download Paper

https://doi.org/10.1088/1681-7575/ad0a35

Local Download

Keywords

gas thermometry, helium, thermodynamic temperature

Citation

Harvey, A. (2023), Small Corrections to 1989 NIST Constant-Volume Gas Thermometry Data, Metrologia, [online], https://doi.org/10.1088/1681-7575/ad0a35, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956523 (Accessed April 27, 2024)