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If the surface is below freezing point and water vapour changes directly into ice crystals, what is this an example of?

Answer and explanation

Correct answer: Frost formation

Correct answer: B, frost formation. First, remember that condensation means water vapour changes into liquid water, while deposition means water vapour changes directly into a solid. When the surface temperature is below 0°C, water vapour may deposit directly as tiny ice crystals on grass, leaves, roofs, or other exposed surfaces. This frozen deposit is called frost or pala. A is wrong because dew consists of liquid water droplets and generally forms when the surface cools to the dew point but remains above freezing. C is wrong because mist is made of tiny liquid water droplets suspended near the ground, not ice crystals attached to a cold surface. D is wrong because rain is liquid precipitation falling from clouds. Memory cue: direct vapour-to-ice change plus a freezing surface means frost; vapour-to-liquid droplets on a non-freezing surface means dew.

Related tags

FrostDepositionIce CrystalsWater VapourForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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