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What is the common initial condition for dew and frost formation?

Answer and explanation

Correct answer: Availability of water vapour in air

Answer: A. Dew and frost are different forms of surface condensation, but both require moisture in the surrounding air. As a surface cools, water vapour may change directly into liquid droplets, producing dew, or, when the relevant temperature is at or below freezing, form ice crystals or frozen deposits known as frost. A identifies the common starting resource: atmospheric water vapour. B is not required; volcanic ash may sometimes provide particles, but it is not the basic condition for either dew or frost. C and D have no role in this atmospheric process. The important comparison is moisture as the similarity and the physical state of the deposit as the difference: liquid for dew and solid ice for frost.

Related tags

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

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