Comments on the Note on “Thermodynamic temperature differences from the ITS-90 for the correction of thermodynamic property data” by F. Pavese,P. Ciarlini,and P.P.M. Steur by J. Fischer,Chairman of WG4 of CCT

These are comments to a note from J. Fischer in publication.     

Note on “Thermodynamic temperature differences from the ITS-90 for the correction of thermodynamic property data” by F. Pavese,P. Ciarlini,and P.P.M. Steur [1]

A recent paper by Pavese et al. presents formulas for calculating the differences (T ? T₉₀) between temperatures measured on the internationally recognized temperature scale, ITS-90 and the thermodynamic temperature.However, there has been a systematic, international process in place to critically review the differences (T ? T₉₀) and to disseminate the results in a convenient form. The process was undertaken by Working Group 4 (WG4) at the request of the Consultative Committee for Thermometry. WG4 recently published the results of its review including consensus values of (T ? T₉₀) and a user-friendly, representation of (T ? T₉₀). One of the authors of the Pavese et al. paper is member of WG4.A multiplicity of representations of (T ? T₉₀) is an undesirable barrier to the exchange of thermodynamic information and obscures the status of temperature standards. Thus, WG4 recommends that the chemical thermodynamics community use the values (T ? T₉₀) and their polynomial representation as published in the WG4 paper.