Corrected version of the VNIIFTRI gas-thermometric scale for the range 2.5–308 K

Abstract

A new version of the VNIlFTRI gas-thermometric scale has been established on the basis of new measurements of the thermal expansion of copper used to make the bulbs of gas thermometers. Scales , differing from the international temperature scales, are established for the range from 13 to 308 K.The articles [ 1, 2] reported the establishment of a new temperature scale by VNIIFTRI (All-Union Scientific Research Institute of Physicotechnical and Electronic Measurements) for the range 2.5-308 K. The scale, created using a gas thermometer, was close to being as accurate as physically possible for the experimental methods then available. Values of temperature based on this scale were used by the Advisory Committee on Thermometry to devise new international temperature scale MTSh-90.At the same time, it was noted in [2] that the extent of the agreement between the thermodynamic and gas temperature scales might be limited by the uncertainty connected with the lack of adequate data on the thermal expansion of copper. These data are used to calculate corrections that account for changes in the volume of the bulb of gas thermometers with temperature.