Question

Give a reason for the following.

Why is diffusion not observed among solids?

Answer 1

Diffusion is the movement of individual molecules of a substance from an area of higher concentration to an area of lower concentration.

• The particles of gases are far away from one another having a very weak force of attraction among the particles.
• Since the particles are free to move, hence, the process of diffusion is the easiest among gases.
• In liquids, particles have space between them, and diffusion takes place slowly.
• In solids the particles are closely packed with each other and not free to move hence, diffusion does not take place in it.

So, diffusion is not observed among solids.