Question

Diffusion is seen in solids

Answer 1

diffusion can take place in gases ,liquids and solids .in solid diffusion is occur due to thermally activated random motions of atom. unless the material is at absolute 0 temperature .

Answer 2

Diffusion can take place in gases, liquids, or solids. 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.