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If air cools below dew point and temperature is also below freezing what may form?

Answer and explanation

Correct answer: Frost

Correct answer: D, frost. The dew point is the temperature at which air becomes saturated and condensation or deposition can begin. If the relevant surface temperature is above freezing, water vapour may form liquid dew. However, when the surface and surrounding temperature are below 0°C, water vapour can change directly into ice crystals or freeze onto the surface. This produces frost. A is incorrect because dew is liquid water and normally requires a surface above freezing. B is a cloud of tiny droplets or ice particles near the ground, not specifically the ice coating described here. C is precipitation falling from clouds and is not the direct result stated. Memory cue: dew is liquid on a cool surface; frost is ice on a freezing surface.

Related tags

GeographyFrostDew PointForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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