Ideal Gas Specific Heats
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IMPORTANT
The ideal gas polynomial equations are ONLY applicable to real gases at low pressures when the ideal gas EOS is applicable.
Recall from Chapter 2, Lesson F that the ideal gas EOS can be used when:
For most gases:
For diatomic gases and the noble gases He, Ne, Ar and Xe:
Often, ideal gas specific heats and heat capacities are approximated as polynomials in terms of T:
where a, b, c, and d are constants for a given substance .
indicates it is an ideal-gas specific heat
Recall from the previous lesson that the internal energy of an ideal gas is a function of T only:
and
Therefore, the heat capacities (or specific heats) for ideal gases reduce to:
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