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If air cools to dew point but the surface is below freezing, which deposit is more likely?

Answer and explanation

Correct answer: Frost

Answer: A, frost. When moist air reaches its dew point next to a surface that is below freezing, the deposited water is likely to appear as ice crystals or a frozen coating rather than ordinary liquid droplets. This deposit is called frost. Option A is correct because the temperature of the surface controls the physical state of the deposit: below freezing favours solid ice. Option B is wrong because liquid dew is more typical when the surface is above the freezing point; at a freezing surface, the deposit freezes or forms directly as ice under suitable conditions. Option C is wrong because fog is suspended in the air, whereas the question asks about a deposit on the surface. Option D is wrong because dry dust is not a water-condensation deposit. Memory cue: dew on a freezing surface becomes frost; fog remains suspended in air.

Related tags

FrostDew PointFreezingCondensation DepositForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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