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Why does diffusion appear in liquids and gases but not in solids?

Answer:

Diffusion appears in liquids and gases because the molecules are able to move freely. Therefore, the molecules are able to move down their concentration gradient. In solids however, the molecules are packed so tightly that a negligible amount of movement occurs and inhibits diffusion.

First answer by ID2791739018. Last edit by ID2791739018. Question popularity: 1 [recommend question].