The pressure dependences of the thermal diffusion factors of the systems He-Ar, He-CO6 at 300 K

Thermal diffusion factors, αT, are reported for systems He-Ar, He-CO2 and He-SF6 at 300 K as functions of concentration and pressure. The measured values at finite pressures are compared with those predicted by the theory of Oost et al., and extrapolated zero pressure values with those calculated by the Chapman-Enskog theory to the third Chapman-Cowling approximation.