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Explain diffusion in solids.
• Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.
• 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.
• Yes, it is possible that, the solid diffuse into solid.
Eg: If we write on the blackboard and leave it uncleaned for a long time we will observe that it is difficult to clean the blackboard afterwards. This is because of the diffusion of chalk particles into the blackboard.
Updated on: 10-Oct-2022
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