Question

The boiling point of water decreases at high altitudes because

• A. the atmospheric pressure is low
• B. the temperature is low
• C. the atmospheric pressure is high
• D. the temperature is high

Answer 1

Answer: (A)

The boiling point of a liquid is the temperature at which its vapour pressure becomes equal to the atmospheric pressure. At high altitudes the atmospheric pressure becomes low, hence the boiling point of water decreases.