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Diffusion

A diagram of diffusion happening. The first diagram shows particles in a liquid. The second shows the same liquid a few seconds later after the particles have spread out

Diffusion is a process where molecules of a material move from an area of high concentration (where there are many molecules) to an area of low concentration (where there are fewer molecules)[1]until it has reached equilibrium (molecules evenly spread).

Diffusion usually happens in a mixture in gas, a liquid and occasionally colloids. It is possible to see diffusion happening when two liquids are mixed in a transparent container. It describes the constant movement of particles in all liquids, gases and colloids. These particles move in all directions bumping into each other.

  1. ↑ "BBC - GCSE Bitesize: Diffusion".

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