Letter | Published:

Kirkendall Effect in Gases

Naturevolume 191page375 (1961) | Download Citation



AN experiment has been described1 in which the motion of fine particles of ammonium chloride smoke in a diffusing gas mixture was considered evidence for a Kirkendall effect in gases. Only a rough semiquantitative interpretation could be given at the time in terms of the usual phenomenological theory of the Kirkendall effect. Subsequent theoretical and experimental work2,3 on gaseous diffusion has shown that the phenomenological theory cannot be correct for gases, but that the classical kinetic theory of gases is capable of accounting for the phenomenon quantitatively. We wish to point out that it is now possible to give a quantitative interpretation to the previous measurements.

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  1. 1

    Miller, L., and Carman, P. C., Nature, 186, 549 (1960).

  2. 2

    McCarty, K. P., and Mason, E. A., Phys. Fluids, 3, 908 (1960).

  3. 3

    Miller, L., and Carman, P. C., Trans. Farad. Soc. (to be published).

  4. 4

    Waldmann, L., Z. Naturf., 14, a, 589 (1959).

  5. 5

    Schmitt, K. H., Z. Naturf., 14, a, 870 (1959).

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  1. Institute for Molecular Physics, University of Maryland, College Park, Md

    • E. A. MASON
  2. National Chemical Research Laboratory, South African Council for Scientific and Industrial Research, Pretoria

    • L. MILLER
    •  & P. C. CARMAN


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