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Which common factor is necessary for both dew and frost?

Answer and explanation

Correct answer: Availability of water vapour

Correct answer: A, availability of water vapour. Dew and frost are both forms of condensation, so the air must contain moisture. First, water evaporates and becomes water vapour. When moist air cools sufficiently, it reaches saturation, and the vapour changes into water or ice on a cold surface. If the temperature is above freezing, liquid droplets form as dew; if the temperature is at or below freezing, ice crystals form as frost. Option A is correct because water vapour is the material from which both forms develop. B is wrong because volcanic ash is not essential; it may sometimes act as a particle, but dew and frost can form without it. C is wrong because sea tides do not provide the necessary condition. D is wrong because dry, hot wind usually reduces moisture and discourages condensation. Memory cue: dew is liquid and frost is ice, but both need atmospheric moisture.

Related tags

DewFrostWater VapourCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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