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Reverse diffusion
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<p>Reverse diffusion refers to a situation where the transport of particles (<a href="/facts/Atom/FoQ4kGN5">atoms</a> or <a href="/facts/Molecule/N9ljSfFq">molecules</a>) in a medium occurs towards regions of higher concentration gradients, opposite to that observed during <a href="/facts/Diffusion/KbAxroBa">diffusion</a>. This phenomenon occurs during <a href="/facts/Phase_(matter)/NkHXDdN3">phase</a> separation and is described by the <a href="/facts/Cahn%25E2%2580%2593Hilliard_equation/Jk8bLqSv">Cahn–Hilliard equation</a>. Reverse diffusion also refers to when water is forced from a region of lower concentration to high. It can occur in <a href="/facts/Osmosis/vYPfyX76">osmosis</a>. </p>