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What is the common initial requirement for both frost and dew formation?

Answer and explanation

Correct answer: Presence of water vapour in air

Answer: A. Both dew and frost involve moisture from the atmosphere and cooling near a surface. Water vapour must be available before either phenomenon can form. If the surface cools enough but the air is extremely dry, there may be too little water for a visible deposit. Dew is generally liquid water deposited on a cool surface, whereas frost is a solid ice deposit formed under freezing conditions; this difference comes later, after the common moisture requirement. B is not a basic requirement, because volcanic ash is not necessary. C concerns ocean movement and does not control ordinary dew or frost formation. D is unrelated to atmospheric condensation. Memory cue: moisture is the common starting point; temperature decides whether the final deposit is liquid dew or solid frost.

Related tags

DewFrostAtmospheric MoistureCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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