Abstract
1. General Remarks. The kinetic theory of gases defines diffusion as the average motion of selected molecules relative to other molecules. The physical units of diffusion are number per square centimeter per second, that is, diffusion velocity times number of selected molecules per cubic centimeter. Diffusion depends on the composition of the gaseous mixture. A classical model considers two sets of molecules of different mass, effective diameter, and velocity distribution. The theory of diffusion results in complicated equations, even in the simple case of binary mixtures in a closed system when the physical state is well defined.
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Lettau, H. (1951). Diffusion in the Upper Atmosphere. In: Malone, T.F. (eds) Compendium of Meteorology. American Meteorological Society, Boston, MA. https://doi.org/10.1007/978-1-940033-70-9_27
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DOI: https://doi.org/10.1007/978-1-940033-70-9_27
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