Diffusion happens in substances that are ____ – liquids or gases. It happens because particles in fluids are moving ____. It cannot happen in solids because the particles in a solid are ____ in place. If there are two or more fluids present in the same area, diffusion will cause the two fluids to ____ together. As substances diffuse, they spread out from an area where they are at a ____ concentration. If diffusion goes on long enough the concentration of the substance ends up the ____ everywhere.

Why diffusion happens

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