The thermal diffusion factor of the nitrogen-hydrogen system has been discussed theoretically. It has been found that the Lennard-Jones potential can reproduce the experimental result, if the hydrogen concentration is below 0.8 in molar fraction. Each experiment done by use of the two-bulb-method in hydrogen concentration 0.74–0.89 has given similarly smaller value than expected theoretically. Such discrepancy may be caused by the theoretical formula of α as well as by the incomplete intermolecular potential.
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Hirota et al. (1954) studied this question.
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