Table 3.

The speeds of sound in noble gases at t = 25 °C from this work based on Eq. 7

Substance	$\mathit{He}$	$\mathit{Ne}$	$\mathit{Ar}$	$\mathit{Kr}$	$\mathit{Xe}$
${\rho }_m(mg/cc)$	0.1786	0.9002	1.7840	3.7490	5.8940
$\sigma ({\mathrm{A}}^{\circ })$	2.576	2.789	3.432	3.675	4.009
$\epsilon /k_B(K^{\circ })$	10.2	35.7	122.4	170.0	234.7
$M(g/mol)$	4.0026	20.1797	39.7920	83.7980	131.2930
$v(m/s)$	787.4806	350.7260	249.5060	171.7220	136.8410