Skip to main content

NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

CCT Key Comparison No 1 (CCT-K1): Realisations of the ITS-90, 0.65 K to 24.5561 K, Using Rhodium-Iron Resistance Thermometers

Published

Author(s)

R L. Rusby, Christopher W. Meyer, Weston L. Tew, D I. Head, K D. Hill, O Tamura, P A. de Groot, B Fellmuth, A Storm, A Peruzzi, J Engert, D N. Astrov, Y Dedikov, G A. Kytin

Abstract

At its meeting in 1996 the CCT initiated five Key Comparisons to test the equivalence of realisations of the ITS-90 between National Measurement Institutes. CCT-K1 covers the temperature range from 0.65 K to 24.5561 K, in which the ITS-90 is defined by specified vapour-pressure equations for 3He (0.65 K to 3.2 K) and 4He (1.25 K to 5.0 K) and interpolation equations for a constant-volume gas thermometer (ICVGT) using 3He or 4He (3 K to 24.5561 K). The comparison was carried out using rhodium-iron resistance thermometers from the seven participating laboratories represented by the authors. The measurements were made in two experiments at NPL, which also coordinated the comparison.
Proceedings Title
TEMPMEKO 2004: 9th International Symposium on Temperature and Thermal Measurements in Industry and Science
Conference Dates
June 22-25, 2004
Conference Location
Cavtat - Dubrovnik , HR

Keywords

gas thermometry, helium vapor pressures, ITS-90, key comparison, resistance thermometry, temperature scales, thermometry

Citation

Rusby, R. , Meyer, C. , Tew, W. , Head, D. , Hill, K. , Tamura, O. , de Groot, P. , Fellmuth, B. , Storm, A. , Peruzzi, A. , Engert, J. , Astrov, D. , Dedikov, Y. and Kytin, G. (2004), CCT Key Comparison No 1 (CCT-K1): Realisations of the ITS-90, 0.65 K to 24.5561 K, Using Rhodium-Iron Resistance Thermometers, TEMPMEKO 2004: 9th International Symposium on Temperature and Thermal Measurements in Industry and Science, Cavtat - Dubrovnik , HR (Accessed October 11, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created May 31, 2004, Updated October 12, 2021
Was this page helpful?