What is meant by diffusion?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Diffusion:**
- Diffusion is defined as the movement of particles from an area of high concentration to an area of low concentration.

2. **Mediums of Diffusion:**
- Diffusion primarily occurs in liquids and gases. This is because the particles in these states of matter are not tightly packed and can move freely.

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