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When the pressure above a liquid is reduced (like in a vacuum), the boiling point of the liquid is

When the pressure above a liquid is reduced (like in a vacuum), the boiling point-example-1
User Prancer
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When the pressure above a liquid is reduced, the force pushing the liquid is reduced, which means it's easier for the molecules of the liquid to escape to the atmosphere.

If it's easier for the molecules to escape, the boiling point decreases, because less energy is needed to evaporate the liquid.

User Abhay Dandekar
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