IPTS-68 Temperature calibration

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Temperature calibration values from IPTS-68, see → Thermocouple Reference Tables Based on the IPTS-68
Primary reference points
Temperature (°C)CompoundTransition
Hydrogen-259.34Triple point
Hydrogen-252.87Boiling point (Normal, 1 Atm)
Neon-246.048Boiling point (Normal, 1 Atm)
Oxygen-218.789Triple point
Oxygen-182.962Boiling point (Normal, 1 Atm)
Water0.01Triple point
Water100Boiling point (Normal, 1 Atm)
Tin231.9681Freezing point
Zinc419.58Freezing point
Silver961.93Freezing point
Gold1064.43Freezing point


Secondary reference points
Temperature (°C)CompoundTransition
Hydrogen-259.194Triple point
Hydrogen-252.753Boiling point (Normal, 1 Atm)
Neon-248.595Triple point
Nitrogen-210.002Triple point
Nitrogen-195.802Boiling point (Normal, 1 Atm)
Carbon dioxide-78.476Sublimation point (Normal, 1 Atm)
Mercury-38.862Freezing point
Water0Freezing point
Diphenyl ether26.87Triple point
Benzoic acid122.37Triple point
Indium156.634Freezing point
Bismuth271.442Freezing point
Cadmium321.108Freezing point
Lead327.502Freezing point
Mercury356.66Boiling point (Normal, 1 Atm)
Sulphur444.674Boiling point (Normal, 1 Atm)
antimony630.74Freezing point
aluminum660.37Freezing point
copper1084.5Freezing point
nickel1455Freezing point
cobalt1494Freezing point
palladium1554Freezing point
platinum1772Freezing point
rhodium1963Freezing point
iridium2447Freezing point
Tungsten3387Freezing point
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