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Diffusion
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This article is about the generic concept of the time-dependent random process. For other uses, see Diffusion (disambiguation).Diffusion describes the spread of particles through random motion from regions of higher concentration to regions of lower concentration. The time dependence of the statistical distribution in space is given by the diffusion equation. The concept of diffusion is tied to that of mass transfer driven by a concentration gradient, but diffusion can still occur when there is no concentra...