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New measurements of thermodynamic temperature  T  with Dielectric-Constant Gas Thermometry (DCGT) were performed at PTB from 50 K to 200 K. Particular care was taken to check for possible systematic sources of errors by performing experiments applying three working gases, namely helium, neon, and argon, the polarizability of which differs by a factor of up to eight. Together with former DCGT values of thermodynamic temperature the new results yield a consistent dataset in the range from 30 K to 200 K. This dataset is in good agreement with the newest results of Acoustic Gas Thermometry (AGT) and Refractive-Index Gas Thermometry (RIGT), which have quite different sources of uncertainty compared with DCGT. The combination of these DCGT, AGT, and RIGT data with the ‘ Estimates of the differences between thermodynamic temperature and the ITS-90 ’, being as an appendix of the ‘ Mise en pratique for the definition of the kelvin in the SI ’ the present-day recommendation of the  Consultative Committee for Thermometry , yields a new function  T  −  T 90  versus ITS-90 temperature  T 90  for the range from 35 K to 195 K, the uncertainty of which is reduced by a factor up to about four.

Thermodynamic-temperature data from 30 K to 200 K