What causes Brownian movement in a colloidal solution?

Explanation

### Step-by-Step Solution:

1. **Definition of Brownian Movement**:
Brownian movement refers to the random, zigzag motion of particles suspended in a fluid (liquid or gas). This movement is not uniform and appears chaotic.

**Hint**: Remember that Brownian movement is characterized by its zigzag pattern.

2. **Nature of the Particles**:
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