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For condensation, what must generally happen to water vapour?

Answer and explanation

Correct answer: Cool down

Direct answer: D, water vapour must generally cool down. Condensation is the change from a gas to a liquid, so water vapour loses heat and energy. When it cools to its dew point under the relevant conditions, it can form tiny liquid droplets; on suitable cold surfaces, these may appear as dew. A is wrong because heating generally supports evaporation, the reverse change from liquid to gas. B is wrong because water vapour does not become dust; dust particles may sometimes provide surfaces around which droplets form. C is wrong because further spreading does not describe the essential change from gas to liquid. D is correct because cooling allows vapour molecules to come together as liquid water. Clouds, fog, and dew are familiar examples. Memory cue: cooling brings vapour down into droplets; heating sends liquid water up as vapour.

Related tags

CondensationCoolingDew PointWater VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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