Density and Heat Capacity of Liquids from Speed of Sound

Table 10

The uncertainty of the reference data.

Substance	Uncertainty, %
	Ar	0.02	2.0	1.0
N2	0.02	0.8	1.0
CO2	0.04	1.5	0.5
CH4	0.03	1.0	0.3
Average	0.03	1.3	0.7