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: [[Diffusion]] cannot happen in a [[solid]] because the [[particle]]s are held in fixed positions.
: In [[diffusion]] the particles always spread from a high [[concentration]] where there is lots of the substance, to a low [[concentration]] where there is less of the substance.
: [[Diffusion]] stops when all substances [[substance]]s are spread out equally and there is no longer a [[Concentration Gradient|concentration gradient]].
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