On Symmetric Multicomponent Diffusion Coefficients

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Abstract
The symmetric set of isotropic multicomponent diffusion coefficients introduced by Curtiss in the context of the kinetic theory of dilute gases are given a general definition and shown to possess general symmetry properties by virtue of Onsager reciprocal relations. Their relationships to Onsager coefficients, Curtiss–Hirschfelder diffusion coefficients, and Bearman–Kirkwood multicomponent friction coefficients are established and employed in stability considerations to deduce results which include the vanishing of Curtiss–Hirschfelder thermal diffusion coefficients in dilute solution as a consequence of the second law of thermodynamics.