Recommended values are given for the difference between the thermodynamic temperature T and T90, the temperature on the International Temperature Scale of 1990, for temperatures below 4.2 K. The recommendations are based on a combination of primary thermometry and thermodynamic calculations. Functions for both the difference T − T90 and its uncertainty are provided.

Topics
Ab-initio methods, Superfluids, Dilution refrigerators, Sensors, Temperature metrology, Thermal instruments, Thermodynamic functions, Thermodynamic properties, Statistical mechanics, Statistical analysis
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