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Why is low temperature alone not enough for frost formation?

Answer and explanation

Correct answer: Because sufficient water vapour in air is also needed

The correct answer is A. Frost is a deposit of frozen water, so two basic conditions are needed: a surface cold enough for freezing and a supply of moisture in the nearby air. When the surface temperature falls below freezing, water vapour may deposit as ice crystals or existing droplets may freeze. If the air is extremely dry, however, there may be too little water available to produce a visible frost layer, even when the temperature is very low. B is wrong because frost forms on cold, not hot, surfaces. C is wrong because frost is made from atmospheric water vapour or frozen water. D is wrong because temperature determines whether the water remains liquid or becomes ice. Memory cue: frost needs cold plus moisture, not cold alone.

Related tags

FrostMoistureLow TemperatureIce DepositionForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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