Vapor-Pressure Thermometry

Part of the International Cryogenics Monograph Series book series (ICMS)


Vapor pressures have been used for a long time for temperature measurements or for calibrating thermometers against a physical property, since the saturated vapor pressure of a pure substance above its liquid phase depends only on temperature. The physical basis of vapor-pressure thermometry has already been discussed in Sect.  2.1 (see Fig.  2.1). Vapor pressures are very commonly used as well for the realization of the fixed points called “boiling points”. These fixed points are simply specific points on the vapor pressure line, generally those at 101 325 Pa (normal boiling point). They do not deserve special attention, as they differ in no way from any other point of the vapor pressure line, and are often simply the highest point attained by the experimenter.

The pressure fixed points based on triple points, treated in Chapter 9, are another application of a specific point of the vapor pressure line.


Temperature Temperature Pressure Pressure Volume Volume Liquid Liquid Scale Scale 
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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Divisione TermodinamicaIstituto Nazionale di Ricerca Metrologica (INRIM)TorinoItaly

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