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Diffusion equation
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== Historical origin == The [[Fick's law of diffusion|particle diffusion equation]] was originally derived by [[Adolf Fick]] in 1855.<ref name="Fick1855">{{cite journal |last1=Fick |first1=Adolf |title=Ueber Diffusion |journal=Annalen der Physik und Chemie |volume=170 |issue=1 |year=1855 |pages=59β86 |issn=0003-3804 |doi=10.1002/andp.18551700105|bibcode=1855AnP...170...59F |doi-access=free }}</ref>
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