# Sensitivity of squared speed of sound to specific impurities
Impurity	D in He	D in Ar
H2	0.23	0.26
He	0.0	0.9
H2O	-3.93	0.12
Ne	-4.0	0.5
N2	-6.27	0.03
O2	-7.3	-0.07
Ar	-9.0	0.0
CO2	-10.3	-0.37
Kr	-20.0	-1.1
Xe	-31.8	-2.3