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Table 1
Definition of T90 in the SPRT subranges of the ITS-90 that overlap above 0 °C.
| SPRT subranges that overlap above 0 °C | Symbol | Deviation function ΔW | Fixed points |
|---|---|---|---|
| 0 °C to 29.7646 °C | (Ga) | a (W–1) | TPWa and MPb of Ga |
| 0 °C to 156.5985 °C | (In) | As for (Ga) | TPW and FrPc of In |
| 0 °C to 231.928 °C | (Sn) | a (W–1) + b (W–1)2 | TPW and FrPs of In and Sn |
| 0 °C to 419.527 °C | (Zn) | As for (Sn) | TPW and FrPs of Sn and Zn |
| 0 °C to 660.323 °C | (Al) | a (W–1) + b (W–1)2+c (W–1)3 | TPW and FrPs of Sn, Zn, and Al |
| –38.8344 °C to 29.7646 °C | (Hg) | As for (Sn) | TPW, TPd of Hg and MP of Ga |
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