Water boils at a lower temperature than `100^(@)C` on a hill station because

Options

A. there cloud formation at high altitudes
B. pressure is lower at high altitudes
C. temperature is lower at high altitudes
D. water vapour are less at high altitudes

Explanation

**Step-by-Step Solution:**

1. **Understanding Boiling Point:**
- The boiling point of a liquid is defined as the temperature at which its vapor pressure equals the surrounding atmospheric pressure.

2. **Effect of Altitude on Atmospheric Pressure:**
- At higher altitudes, such as hill stations, the atmospheric pressure is lower than at sea level. This is due to the thinner air at higher elevations.

3. **Relationship Between Atmospheric Pressure and Boiling Point:**
- The boiling point of water is directly proportional to the atmospheric pressure. This means that as atmospheric pressure decreases, the boiling point also decreases.

4. **Conclusion:**
- Therefore, at hill stations where the atmospheric pressure is lower, water will boil at a temperature lower than `100°C`. This is because it requires less heat (lower temperature) for the vapor pressure of the water to equal the lower atmospheric pressure.

5. **Final Answer:**
- Water boils at a lower temperature than `100°C` on a hill station because the atmospheric pressure is lower at high altitudes.

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