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===Meaning===
[[Diffusion]] is when [[particles]] spread from a region of high [[concentration]] to a region of low [[concentration]].
===About Diffusion===
: [[Diffusion]] can only happen in a [[fluid]] which means a [[liquid]] or a [[gas]] because the [[particle]]s can move past each other.
: [[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 are spread out equally and there is no longer a [[Concentration Gradient|concentration gradient]].
{| class="wikitable"
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|[[File:Diffusion.png|center|500px]]
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| style="height:20px; width:500px; text-align:center;" |This [[diagram]] shows a high [[concentration]] of blue [[particle]]s on the left separated from the red [[particle]]s by a barrier. When the barrier is removed the blue particles [[diffuse]] to the area of lower [[concentration]] on the right. [[Diffusion]] continues until all [[particle]]s are equally spread.
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