2022 Update for the Differences Between Thermodynamic Temperature and ITS-90 Below 335 K

Christof Gaiser (1) , Bernd Fellmuth (1) , Roberto Gavioso (2) , Murat Kalemci (3) , Vladimir Kytin (4) , Tohru Nakano (5) , Anatolii Pokhodun (6) , Patrick Rourke (7) , Richard Rusby (8) , Fernando Sparasci (9) , Peter Steur (2) , Weston Tew (10) , Robin Underwood (8) , Rod White (11) , Inseok Yang (12) , Jintao Zhang (13)

1 PTB - Physikalisch-Technische Bundesanstalt [Berlin]
2 INRiM - Istituto Nazionale di Ricerca Metrologica
3 TUBITAK UME - TUBITAK National Metrology Institute [Kocaeli, Turkey]
4 VNIIFTRI - National Research Institute for Physical-technical and Radiotechnical Measurements
5 NMIJ - National Metrology Institute of Japan
6 VNIIMS, Russian State Committee for Standarts
7 NRC - National Research Council of Canada
8 NPL - National Physical Laboratory [Teddington]
9 LCM - Laboratoire commun de métrologie LNE-CNAM
10 NIST - National Institute of Standards and Technology [Gaithersburg]
11 MSL - Measurement Standards Laboratory of New Zealand
12 KRISS - Korea Research Institute of Standards and Science [Daejon]
13 National Institute of Metrology [Beijing]

In 2011, a working group of the Consultative Committee for Thermometry published their best estimates of the differences between the thermodynamic temperature T and its approximation ( T 90 ), the temperature according to the International Temperature Scale of 1990, ITS-90. These consensus estimates, in combination with measurements made in accordance with ITS-90, are an important alternative to primary thermometry for those requiring accurate measurements of thermodynamic temperature. Since 2011, there has been a change in the definition of the kelvin and significant improvements in primary thermometry. This paper updates the ( T − T 90 ) estimates by combining and analyzing the data used for the 2011 estimates and data from more recent primary thermometry. The results of the analysis are presented as a 12th-order polynomial representing the updated consensus values for the differences and a sixth-order polynomial for their uncertainty estimates.

Domains: Engineering Sciences [physics]

Christof Gaiser, Bernd Fellmuth, Roberto Gavioso, Murat Kalemci, Vladimir Kytin, et al.. 2022 Update for the Differences Between Thermodynamic Temperature and ITS-90 Below 335 K. Journal of Physical and Chemical Reference Data, 2022, 51 (4), pp.043105. ⟨10.1063/5.0131026⟩. ⟨hal-03959928⟩