Question

why liquid boils when its vapour pressure equals external pressure.

Answer 1

Answer:

A liquid boils when its saturated vapour pressure becomes equal to the external pressure on the liquid. When that happens, it enables bubbles of vapour to form throughout the liquid - those are the bubbles you see when a liquid boils.

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Answer 2

Answer:

Because it expands

Explanation:

A liquid wouldn't boil in a traditional sense it will turn in a gas without heat. As liquid is basically condensed gas so u can have more gas in a smaller space. As the pressure decreases the liquid molecules will occupy the space by expanding.

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