Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

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 nist-equations for 3He (0.65 K to 3.2 K) and 4He (1.25 K to 5.0 K) and interpolation nist-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 , -1

Keywords

gas thermometry, helium vapor pressures, ITS-90, key comparison, resistance thermometry, temperature scales, thermometry
Created June 1, 2004, Updated February 19, 2017