Binary diffusion coefficients of homologous species in argon

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Abstract
The diffusion coefficients of binary mixtures of argon with the first five members of the alkane series have been determined. The measurements were performed at atmospheric pressure, in the temperature range 300-700K, by means of an improved chromatographic method. The uncertainty in the absolute values of the diffusion coefficients is estimated as +or-2%. The diffusion coefficient measurements for the two geometric isomers of butane in argon have been performed in such a way as to allow direct determination of their ratio with an uncertainty of +or-2%. The results have been employed to examine the regularities in diffusion coefficients of homologous species in mixtures with a common gas. In addition, it is shown that the cross-section of iso-butane in collision with argon is greater than that for normal butane at the same temperature. This result is in opposition to the expectation from a current theory.