Abstract
IN a recent paper (Jour. Amer. Chem. Soc., October 1925) E. Mack has calculated the cross-section of the iodine molecule from the results of his experiments upon the rate of diffusion of iodine in air; the result of the calculation is a value agreeing closely with the figure given by Prof. A. O. Rankine (15·6 × 1016cm.2). But the agreement would seen to be accidental, and to arise from two circumstances: (1) Mack's experimental result for the diffusion coefficient is about 30 per cent, too large. (2) The method employed to calculate the cross-section is illegitimate.
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TOPLEY, B. The Size of the Iodine Molecule. Nature 118, 802–803 (1926). https://doi.org/10.1038/118802a0
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DOI: https://doi.org/10.1038/118802a0
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