Question

A liquid boils when vapour pressure becomes equal to atmospheric pressure.

• A. True
• B. False

Answer 1

The correct option is A True

True.
Vapor pressure is the gas pressure emitted by a liquid. It does not push down on the liquid. Instead, it is the pressure at which the gas and liquid are in equilibrium with one another at a particular temperature.
As the gas bubble forms within the liquid, the vapour pressure within the bubble must be equal to atmospheric pressure to escape the surface, at which point the liquid boils.