Question

Why do solids not diffuse in one another?? ​

Answer 1

Answer:

This is because of diffusion , the movement of particles from an area of high concentration to an area of low concentration. ... This means that diffusion does not happen in solids – the particles in a solid can only vibrate and cannot move from place to place.

Answer 2

Answer:

Solid do not diffuses into one another because the particles in solid are fixed about their position and they can't leave their position as they are hold by a strong force of attraction.

in short - the particles in solid are fixed about their position.