Journal
METROLOGIA
Volume 56, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1681-7575/ab29a2
Keywords
primary thermometry; acoustic gas thermometry; ITS-90
Categories
Funding
- EMRP programme [SIB01 InK, 15SIB02 InK 2]
- EMPIR programme [SIB01 InK, 15SIB02 InK 2]
- European Union's Horizon 2020 research and innovation programme
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We report speed of sound measurements in helium at 273.16 K and at eight temperatures in the range between 236K and 430 K. These results determine the difference (T - T-90) between the thermodynamic temperature T and its approximation T-90 by the International Temperature Scale of 1990 (ITS-90). The uncertainty of our measurements of (T - T-90) spans between a minimum of 0.25 mK near 247 K and a maximum of 0.89 mK at the freezing point of indium (429.75 K) with comparable contributions from the uncertainty of our acoustic determination of T and from the uncertainty of our laboratory realization of ITS-90. On the overlapping temperature ranges these results are consistent with other recent acoustic determinations of (T - T-90). We also present evidence that (T - T-90) can be determined with comparably small uncertainties by the alternative, time-saving procedure of measuring the speed-of-sound in helium using only a single, judiciously-chosen, pressure on each isotherm.
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