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Entropy Determined from Heat of Compression at High Pressure for Benzene and Carbon Tetrachloride

  • P. Pruzan
  • L. Ter Minassian
  • A. Soulard

Abstract

The entropy Variation ds(T,p) may be determined with accuracy when computed from heat capacity and expansivity measurements from
$$ds = {c_P}\left( {\frac{{dT}}{T}} \right) - \alpha v\,dp$$
(1)
When the variable is only the temperature, the measurement of cp provides a convenient and sensitive but partial method for the study of the phase transitions. Extension to include the variable pressure requires elaborate techniques and as a consequence the entropy data as a function of pressure are scarce and unreliable. The gap may be filled when the second term in (1), (∂s/∂p)T, is measured directly. This term has the meaning of an entropy Variation resulting from isothermal liberation of the heat of compression and has been shown to be measurable by calorimetric methods at high pressures [1–3]. Following these methods, successive isotherms are determined as a function of pressure and the result is a full description of the phases and of their mutual transformations. The present paper deals with such piezothermal results obtained with benzene and carbon tetrachloride under their liquid and solid states up to pressures of 4 and 7 kbars.

Keywords

Carbon Tetrachloride Solid Direction Hydraulic Fluid Adiabatic Calorimeter Mutual Transformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • P. Pruzan
    • 1
  • L. Ter Minassian
    • 1
  • A. Soulard
    • 2
  1. 1.Laboratoire de Chimie PhysiqueParisFrance
  2. 2.Laboratoire de Minéralogie CristallographieParisFrance

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