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What is the main difference between evaporation and boiling?

Answer and explanation

Correct answer: Evaporation occurs at the surface, while boiling occurs throughout the liquid

Correct answer: A. Evaporation is the gradual change of liquid into vapour from the exposed surface. It can occur below the boiling point because some surface molecules have enough energy to escape. Boiling is a rapid process that occurs throughout the liquid when the liquid reaches its boiling point under the given pressure; vapour bubbles form inside and rise to the surface. A therefore gives the key difference. B is wrong because both processes concern liquids and vapours, not only ice. C is wrong because boiling requires heat input or suitable thermal energy. D is wrong because evaporation is not restricted to the freezing point. Memory cue: evaporation is a surface process; boiling is a bulk process.

Related tags

GeographyEvaporationBoilingPhase ChangeHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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