Question

What happens to diffusion, when two solids are in contact?

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 does not take place when two solids are in contact.