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'''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 [https://en.wikipedia.org/wiki/Mass_transfer mass transfer], driven by a concentration gradient.

The concept of diffusion emerged in the [[Natural Sciences|physical sciences]]. The [[paradigm]]atic examples were [http://en.wikipedia.org/wiki/Heat_diffusion heat diffusion], [http://en.wikipedia.org/wiki/Molecular_diffusion molecular diffusion] and [http://en.wikipedia.org/wiki/Brownian_motion Brownian motion]. Their [[mathematical]] description was elaborated by [http://en.wikipedia.org/wiki/Joseph_Fourier Joseph Fourier] in 1822, [http://en.wikipedia.org/wiki/Adolf_Fick Adolf Fick] in 1855 and by [http://en.wikipedia.org/wiki/Albert_Einstein Albert Einstein] in 1905.

The concept of diffusion emerged in the [[Natural Sciences|physical sciences]]. The [[paradigm]]atic examples were [https://en.wikipedia.org/wiki/Heat_diffusion heat diffusion], [https://en.wikipedia.org/wiki/Molecular_diffusion molecular diffusion] and [https://en.wikipedia.org/wiki/Brownian_motion Brownian motion]. Their [[mathematical]] description was elaborated by [https://en.wikipedia.org/wiki/Joseph_Fourier Joseph Fourier] in 1822, [https://en.wikipedia.org/wiki/Adolf_Fick Adolf Fick] in 1855 and by [https://en.wikipedia.org/wiki/Albert_Einstein Albert Einstein] in 1905.

Applications outside physics were pioneered by [http://en.wikipedia.org/wiki/Louis_Bachelier Louis Bachelier] who in 1900 used a [[random]] walk [[model]] to describe price fluctuations on [[financial]] markets. In a less [[quantitative]] way, the concept of diffusion is invoked in the [[social sciences]] to describe the spread of [[ideas]].[http://en.wikipedia.org/wiki/Diffusion]

Applications outside physics were pioneered by [https://en.wikipedia.org/wiki/Louis_Bachelier Louis Bachelier] who in 1900 used a [[random]] walk [[model]] to describe price fluctuations on [[financial]] markets. In a less [[quantitative]] way, the concept of diffusion is invoked in the [[social sciences]] to describe the spread of [[ideas]].[https://en.wikipedia.org/wiki/Diffusion]

[[Category: General Reference]]

[[Category: General Reference]]