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Diffusion coefficients and thermal diffusion factors are reported for binary mixtures of hydrogen with neon, argon, krypton, and xenon: the temperature range for the former measurements is 200-340 and 255-350 K for the latter. The results are used to test excellent potential functions which have recently been reported for hydrogen-noble gas interactions.

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Diffusion coefficients and thermal diffusion factors are reported for several binary systems of carbon monoxide and oxygen with noble gases. Using approximate spherical potential functions, most of which have been reported in the literature, the experimental results are compared with the predictions of the Chapman-Enskog theory.

Diffusion coefficients are reported for the systems N 2-C02, 02-C02, N 2-02 and Ar-C0 2. Thermal diffusion factors have also been measured for the first two systems and used, together with the above diffusion coefficients and second virial coefficients from the literature, to derive approximate spherical potentials to describe the unlike interactions in these two systems.