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Why can frost be seen more often on winter mornings?

Answer and explanation

Correct answer: The surface may cool below freezing at night

Correct answer: A. Frost is favoured when a surface becomes colder than the freezing point while moisture is available in the nearby air. During many winter nights, the ground and exposed leaves lose heat and cool strongly. If their temperature reaches below 0°C, water vapour can deposit as solid ice crystals, or a very thin liquid deposit can freeze. By morning, the white icy coating is visible. A is correct because it gives the essential cold-surface condition. B is wrong because winter air can still contain water vapour; without moisture, frost would not form. C is wrong because strong daytime sunlight does not explain the cold night-time surface. D is wrong because boiling requires intense heating and is opposite to frost formation. Memory cue: frost needs freezing cold plus available moisture, especially after a cold night.

Related tags

WinterFrostFreezingWater VapourForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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