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Why is caution needed in calling frost simply frozen dew?

Answer and explanation

Correct answer: Because frost can also form by vapour directly becoming ice

Correct answer: B. Frost is a solid form of atmospheric moisture that appears on a cold surface. Dew usually forms when water vapour changes into liquid droplets on a surface; if those droplets later freeze, the frost may be described as frozen dew. However, frost can also form directly when water vapour changes into ice crystals without first becoming liquid. This direct change is called deposition. Therefore, it is not scientifically complete to call every frost deposit frozen dew. Option A is wrong because frost is ice or ice crystals. Option B is correct because vapour can deposit directly as ice. Option C is wrong because frost can form on land and objects in suitable cold conditions. Option D is wrong because frost is made from atmospheric water. Memory cue: dew is usually liquid, while frost is solid; frost may arise by freezing or direct deposition.

Related tags

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

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