In these equations vl and v2 are the average velocities of particles of components 1 and 2 in an arbitrary coordinate system, N1 and N2 are the mol fractions of 1 and 2, and Vm is the molar volume.Values of diffusion coefficients calculated by two methods are compared in Table III. While the two methods yield almost the same value for D, Wagner's method is preferable since it allows for shifts due to changes in the specific volumes of the phases, as well as displacement of the specimen surfaces.The author wish to acknowledge the support of the N.A.S.A. Lewis Research Laboratory under Grant NGR 33-015-160.
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