Specific Heats of Gases

  • E. S. R. Gopal
Part of the The International Cryogenics Monograph Series book series (INCMS)


The heat capacity of a gas depends strongly upon the conditions under which heating is done, whether at constant pressure or at constant volume. Indeed, it was pointed out in Chapter 1 that the ratio C p /C υ is as high as 1.67 for a monatomic gas. It is possible to measure directly both C p and C υ in gases and vapors, and a representative list1 of the values at 300°K is given in Table 6.I. The specific heats refer to the “ideal” state of a gas at zero pressure and are calculated from the values at higher pressures by using a knowledge of the equation of state [see equation (1.17)]. Typically, at a pressure of 1 atm, C p and C υ are higher than the “ideal” values by less than 1% in the so-called permanent gases and by about 1 to 2% in organic vapors.


Partition Function Diatomic Molecule Statistical Entropy Total Wave Function Residual Entropy 
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Copyright information

© Plenum Press 1966

Authors and Affiliations

  • E. S. R. Gopal
    • 1
  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia

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