Question

A decrease in pressure lowers the boiling point of a liquid.

• A. True
• B. False

Answer 1

The correct option is A True

• Boiling point: The temperature at which vapour pressure of the liquid is equal to the pressure of the gas above the liquid, is called the boiling point of that liquid.
• For a liquid to become vapour it needs to overcome the pressure of the gas above it.
• If the pressure above the liquid decreases, it requires less heat for the vapours of liquid to overcome the above pressure.
• Hence, the boiling point of the liquid decreases by decreasing the pressure of the gas above it.