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What causes droplets to form on a cold car glass in the morning?

Answer and explanation

Correct answer: Condensation of water vapour on a cold surface

Answer: D. Air contains water vapour, even when the vapour cannot be seen. During the night, the car glass may cool below the temperature of the surrounding air. The thin layer of moist air touching the glass is cooled, and when it reaches its dew point, it becomes unable to retain all its vapour. The excess vapour changes into visible liquid droplets on the glass. D is correct and is a familiar everyday example of dew or surface condensation. A is wrong because glass does not melt under ordinary morning cooling. B is wrong because the Sun does not directly turn into water. C is wrong because completely dry air would not provide vapour for droplets. The glass must be cool and the air must contain moisture. Memory cue: cold surface plus moist air produces droplets.

Related tags

DewCar GlassCold SurfaceCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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