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Why can dew disappear quickly after sunrise?

Answer and explanation

Correct answer: Surface warming increases evaporation of droplets

Direct answer: A is correct. Dew forms when a surface cools enough for nearby air to reach saturation and water vapour condenses into liquid droplets on grass, leaves, roofs, or other objects. After sunrise, incoming solar radiation warms the surface. As the temperature rises, the liquid droplets receive more energy and their evaporation becomes faster; some moisture also mixes into the air. If the surface warms above the relevant dew-point condition, the droplets no longer remain stable and disappear. A correctly connects sunlight, surface warming, and evaporation. B is scientifically meaningless because sunlight does not turn vapour into stone. C is wrong because air pressure does not always become zero after sunrise. D is wrong because dew is not transformed into ocean waves. Dew may persist longer in shade or humid, cool conditions, so “quickly” means under favourable warming conditions, not every morning. Memory cue: sunrise heats the surface; heat sends dew back to vapour.

Related tags

DewSunriseEvaporationCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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