Thermodynamic Properties of Vapors from Speed of Sound

Table 6

AAD along the saturation line.

Substance	AAD [%]
	𝑍	𝑐𝑣	𝑐𝑝
Ar	0.0004	0.0093	0.0142
N2	0.0009	0.0180	0.0235
CH4	0.0009	0.0155	0.0220
CO2	0.0004	0.0093	0.0160
Mean	0.0007	0.0130	0.0189