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When does a liquid start boiling?

Answer and explanation

Correct answer: When its vapour pressure becomes equal to the external pressure

Boiling begins when vapour bubbles can form throughout the liquid and their pressure can resist the pressure outside the liquid. This occurs when the liquid’s vapour pressure becomes equal to the external pressure. The boiling temperature therefore depends on both the liquid and the surrounding pressure; lowering external pressure lowers the boiling point. Colour change, zero volume, or absence of solute is not the defining condition.

Related tags

BoilingExternal PressureVapour PressureEquilibrium In Physical And Chemical ProcessesEquilibriumChemistryClass 11 Mcq

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