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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