Why mercury is used in barometer for measuring atmospheric pressure?

Explanation

### Step-by-Step Solution:

1. **Introduction to Barometers:**
- A barometer is an instrument used to measure atmospheric pressure. It typically consists of a column of liquid in a tube, where the height of the liquid column changes in response to changes in atmospheric pressure.

2. **Reason for Using Mercury:**
- **Non-Stick Property:** Mercury does not adhere to the walls of the barometer tube. This non-sticky characteristic minimizes friction, allowing mercury to rise and fall smoothly with changes in atmospheric pressure. If a liquid were sticky, it would create friction that could lead to inaccurate pressure readings.

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