Thermodynamic Properties of Vapors from Speed of Sound

Table 5

AAD in the subcritical domain.

Substance	AAD [%]
	𝑍	𝑐𝑣	𝑐𝑝
Ar	0.0001	0.0025	0.0037
N2	0.0003	0.0048	0.0061
CH4	0.0003	0.0062	0.0078
CO2	0.0005	0.0048	0.0069
Mean	0.0003	0.0046	0.0061