Gas Thermometry between 0.5 K and 273.16 K
Chronologically, gas thermometry was the first method used for the accurate measurement of the thermodynamic temperature—with air used as a working substance—the reason being that the very simple law of the ideal gas [Eq. (1.16)] is applicable to several real gases with close approximation. Air was soon replaced by hydrogen and then by helium. The reader is directed to the “Further Readings” at the end of Part I, for the history and the developments of gas thermometry.
KeywordsTriple Point Virial Coefficient Dead Volume Molar Density Bulb Volume
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