its-90

ITS-90 is the current version of the International Temperature Scale. It gives defining values in Kelvin of various events over a wide range of temperatures. Although the Kelvin is defined using absolute zero (0K) and the triple point of water (273.16K), it is impractical to use this definition at temperatures very different form the triple of water. The items on the scale can thus be used to calibrate instruemnts over a wide range of tempertures. The table belows shows some items on the scale.

Fixed point	Temperture (K)
Triple point of Neon	24.5561
Triple point of Hydrogen	13.81
Triple point of Oxygen	54.361
Freezing point of Oxygen	90.188
(Triple point of water	273.16)
Freezing point of tin	505.1181
Freezing point of silver	1234.93
Freezing point of copper	1357.77

Sources

Physics, Patrick Fuller, pub. 1994 by Heinemann.

* Internet resource for the International Temperature Scale of 1990

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