Monatomic Gases (Noble Gases)
For monatomic gases, i.e., the noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), the specific heats are true constants with the values
and the caloric equation of state follows from straightforward integration as
With cp = const, the integration in (6.20) can be performed easily, and the entropy becomes
Since the resulting expressions for the thermodynamic quantities of monatomic gases are rather simple, these are typically not tabulated.
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