diffusion in solids in solids
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The spreading out and mixing of a substance with another substance due to the motion of its particles is called diffusion. ... Diffusion occurs in gases, liquids and solids. Diffusion is fastest in gases and slowest in solids. The rate of diffusion increases on increasing the temperature of the diffusing substance.
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In solids, particularly, diffusion occurs due to thermally-activated random motion of atoms - unless the material is at absolute zero temperature (zero Kelvin), individual atoms keep vibrating and eventually move within the material. ... There are many mechanisms for diffusion in solids.
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