The Temperature Variation of Diffusion Processes

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Abstract
The Eyring concept of holes in liquids and his theory of absolute reaction rates indicate that diffusion coefficients should vary exponentially with temperature. Data in the literature indicate that this is true. It is shown that empirical observations concerning the relation between diffusion velocity and its temperature coefficient, hitherto generally assumed to be linear, are readily explained upon the basis of holes in liquids as a controlling factor. As with viscosity, in liquids containing hydrogen bonds relatively high activation energies of diffusion are found. Data for small diffusing molecules should not show a constant diffusion-viscosity product as required by the Stokes-Einstein relation at constant temperature, but a product varying within restricted ranges with the dimensions of the solvent molecules. Data already available tend to confirm this conclusion.

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