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. 2001 Feb 1;106(1):105–149. doi: 10.6028/jres.106.006

Table 5.

Long-stem standard platinum resistance thermometer ITS-90 calibrations. The expanded uncertainty (k = 2) is denoted by U

ITS-90 Fixed Points Ar TP Hg TP H2O TP Ga MP In FP Sn FP Zn FP Al FP Ag FP
ITS-90 assigned temperature (°C) −189.3442 −38.8344 0.01 29.7646 156.5985 231.928 419.527 660.323 961.78
ITS-90 subranges U
(mK)
U
(mK)
U
(mK)
U
(mK)
U
(mK)
U
(mK)
U
(mK)
U
(mK)
U
(mK)
Max U
(mK)
−189.3442 °C to 0.01 °C 0.08 0.14 0.02 0.27
−38.8344 °C to 29.7646 °C 0.14 0.02 0.04 0.14
0 °C to 29.7646 °C 0.02 0.04 0.04
0 °C to 156.5985 °C 0.02 0.10 0.10
0 °C to 231.928 °C 0.02 0.10 0.24 0.24
0 °C to 419.527 °C 0.02 0.24 0.41 0.41
0 °C to 660.323 °C 0.02 0.24 0.41 0.64 0.64
0 °C to 961.78 °C 0.02 0.24 0.41 0.64 1.06 1.06