‎"SMOLUCHOWSKI, MARIAN.‎
‎Über Brownsche Molekularbewegung unter Einwirkung äusserer Kräfte und deren Zusammenhang mit der verallgemeinerten Diffusionsgleichung. - [THE SMOLUCHOWSKI EQUATION]‎

‎Leipzig, Barth, 1915. 8vo. In the original printed wrappers. Author's presentation offprint with the printed presentation statement on top of frontwrapper ""Überreicht vom Verfasser"" [i.e. ""Given by the author""]. Offprint from ""Annalen der Physik"", Vierte Folge, Band 48, 1915. A very fine copy, near mint. Pp. 1103-1112.‎

Reference : 48659

‎Scarce presentation offprint with the printed presentation of Smolukowski's important drift-diffusion equation or the Smoluchowski equation. Here he documented that In some cases, the average velocity field exists because of a force, for example, the equation might describe the flow of ions dissolved in a liquid, with an electric field pulling the ions in some direction. This is referred to as the drift-diffusion equation (not to be confused with the Einstein-Smoluchowski relation)‎