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Where there are two (or more) substances in contact, diffusion happens as particles of one substance move from an area where there are a lot of those particles to an area where there are fewer of those particles. The process can happen in the gas, liquid and solid phase.

Note, diffusion is driven by random movement of the particles not by mechanical mixing, the phase of the system will therefore largely determine the rate of diffusion.

The term is also used in a more abstract manner to describe spreading of something more widely. The movement of a substance from a region of high concentration into a region of low concentration is called diffusion.

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