Write short notes on the following
(b) Brownian Movement

Explanation

### Step-by-Step Solution:

1. **Definition of Brownian Movement**:
Brownian movement refers to the random and erratic motion of colloidal particles suspended in a fluid (liquid or gas). This phenomenon is named after the botanist Robert Brown, who first observed it in pollen grains suspended in water.

2. **Nature of Colloidal Particles**:
Colloidal particles are small particles that are larger than molecules but smaller than those that can be seen with the naked eye. They typically range in size from 1 nanometer to 1 micrometer.

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