Question

explain diffusion in solid

Answer 1

Answer: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.

Step-by-step explanation:

Answer 2

$\huge {\bf{\red{Diffusion\: in \:Solids}}}$

Many people think that diffusion does not take place in solids. But, the process of diffusion takes place very, slowly in solids because the particles in solids do not move from their fixed positions. However, the constituent particles in solids vibrate about their fixed positions. We can explain this with few examples.

$\bf{\red{\underline {Example 1:}}}$ When two metal blocks are bound together tightly and kept undisturbed for a few years, then the particles of one metal have been found to diffuse into the other metal.

$\bf{\red{\underline {Example 2 :}}}$ When we write on a blackboard using chalk and leave it uncleaned for a considerable period of time, we will find it difficult to clean the blackboard later. This is because some of the particles of chalk have diffused into the surface of the blackboard.