At high altitude, external pressure is lower. What is its effect on boiling point?
Answer and explanation
Correct answer: Boiling point decreases
A liquid boils when its vapour pressure equals the external pressure. At high altitude, atmospheric pressure is lower, so the liquid reaches this required vapour pressure at a lower temperature. Consequently, the boiling point decreases. This is why water can boil below 100°C at high altitude, although boiling does not mean that heating becomes unnecessary.
Frequently asked questions
What is the correct answer to this question?
Boiling point decreases
Why is this the correct answer?
A liquid boils when its vapour pressure equals the external pressure. At high altitude, atmospheric pressure is lower, so the liquid reaches this required vapour pressure at a lower temperature. Consequently, the boiling point decreases. This is why water can boil below 100°C at high altitude, although boiling does not mean that heating becomes unnecessary.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Equilibrium. Topic: Equilibrium in physical and chemical processes.
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