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At which surface does evaporation occur?

Answer and explanation

Correct answer: At the free surface of a liquid

In evaporation, molecules at the free surface of a liquid gain sufficient kinetic energy and escape as vapour. Therefore, it occurs only at the liquid surface. In contrast, boiling occurs throughout the liquid. Exam tip: associate “surface” with evaporation and “throughout the liquid” with boiling.

Related tags

EvaporationFree SurfaceLiquidStates Of MatterBoilingNature Of MatterSome Basic Concepts Of ChemistryChemistry

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