Thermal Diffusion in the Nonpolar–Polar System Helium–Methyl Chloride

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Abstract
The thermal diffusion factor αT for a 1:1 mixture of He and CH3Cl has been measured by the two-bulb method at different temperatures ranging from 338°–530°K. The composition dependence of αT for this system has also been studied at 362.8°K. For the temperature dependence of αT the agreement between experimental and calculated values is poor even when inelastic collisions are taken into account. For the composition dependence of αT the theoretical and experimental curves run approximately parallel to each other over the whole composition range. This probably means that the inelastic collisions do not play a significant role in the thermal diffusion phenomenon of this system.