IV. Thermal diffusion in mixtures of molecules of small mass difference

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Abstract
The thermal diffusion effect has been examined in gas mixtures in which the difference in the molecular masses is small and the heavier molecule has the smaller diameter. In such cases Chapman (1940) has shown from theoretical considerations that the thermal diffusion factor α may be negative (the heavier molecule then diffuses up the temperature gradient), or it may change sign with changing proportions of the constituents. This change of sign was found to occur in Ne-NH3 mixtures ; it did not occur in A-HC1 mixtures. N2O-CO2 mixtures were also examined, since the experimental data of viscosity and diffusion suggest that here too are versal of sign of a may occur with changing composition. No reversal was found.

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