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In which condition can frost be seen on leaves instead of dew?

Answer and explanation

Correct answer: The leaf surface is very cold and below freezing

Correct answer: A. Dew is liquid water deposited on a cool surface, whereas frost is ice deposited or formed when the surface temperature is at or below the freezing point. Therefore, if a leaf becomes very cold and falls below freezing, water vapour can change directly into ice crystals, or deposited water can freeze. A is correct because it gives the essential temperature condition. B is wrong because strong midday heat warms leaves and promotes evaporation rather than frost formation. C is wrong because completely dry air supplies little water vapour, so there is not enough moisture for frost. D is wrong because burning leaves are hot and damaged, not a normal setting for frost. Memory cue: above freezing usually suggests dew; below freezing suggests frost.

Related tags

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

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