Why is mercury used in a thermometer ? Is it suitable for measuring high temperature ? Name the liquid which can be used for the measurement of high temperatures. Give reasons.

Explanation

**Step-by-Step Solution:**

1. **Why is mercury used in a thermometer?**
- Mercury is used in thermometers because it expands uniformly when heated. This means that as the temperature increases, the volume of mercury increases in a consistent manner, allowing for accurate temperature readings. Additionally, mercury has a weak force of attraction to the glass of the thermometer, which helps it to move freely and rise in the tube without sticking.

2. **Is mercury suitable for measuring high temperatures?**
- No, mercury is not suitable for measuring high temperatures. The reason for this is that mercury has a relatively low boiling point of about 356.73°C (674.11°F). When temperatures exceed this boiling point, mercury will vaporize, rendering the thermometer ineffective.

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