Table 3. Mean-Free Path of Gas Molecules (nm) from MD Simulations (λ_MD) with σ_col = σ_gas and Kinetic Theory (λ_KT)^a.

	300 K		330 K
gas	λKT	λMD	λKT	λMD
H2	8.45	10.47	9.13	12.02
He	10.40	10.91	11.65	11.89
Ar	6.23	6.01	6.87	6.31
CH4	4.98	4.76	6.09	5.93
CO2	3.01	3.04	4.59	5.20

^aσ_col is the collision diameter and σ_gas is the diameter of the gas molecule that is the Lennard–Jones collision diameter (σ).