Dictionary · Temperature
ITS-90
The International Temperature Scale of 1990: defined fixed points (e.g. the triple point of water, 273.16 K) and specified interpolation instruments through which practical temperature measurement is realized worldwide.
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Standard platinum resistance thermometer (SPRT)
The interpolation instrument of the ITS-90 between defined fixed points over most of its range: a strain-free platinum resistor whose resistance ratio W(T) maps to temperature.
ITS-90