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[[File:lighterstill.jpg]][[File:LightDiffusion.jpg|right|frame]]
[[File:lighterstill.jpg]][[File:LightDiffusion.jpg|right|frame]]
'''Diffusion''' is a [[time]]-dependent [[process]], constituted by [[random]] [[motion]] of given [[entities]] and [[causing]] the [[statistical]] [[distribution]] of these entities to spread in [[space]]. The [[concept]] of diffusion is tied to notion of [http://en.wikipedia.org/wiki/Mass_transfer mass transfer], driven by a concentration gradient.
'''Diffusion''' is a [[time]]-dependent [[process]], constituted by [[random]] [[motion]] of given [[entities]] and [[causing]] the [[statistical]] [[distribution]] of these entities to spread in [[space]]. The [[concept]] of diffusion is tied to notion of [http://en.wikipedia.org/wiki/Mass_transfer mass transfer], driven by a concentration gradient.
