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If on a clear night the surface cools to dew point but remains above freezing point which form is most likely?

Answer and explanation

Correct answer: Dew

Correct answer: A, dew. Air contains water vapour, and the dew point is the temperature at which that air becomes saturated. When a surface cools to the dew point, vapour begins to condense on that surface. The second clue is that the temperature remains above freezing. Thus the condensed water stays liquid and forms dew on grass, leaves, or soil. Frost requires ice crystals and therefore freezing conditions at the relevant surface. Fog and mist are suspended droplets in the air, not the direct surface deposit described in the question. So B is rejected because the surface is above freezing, while C and D are rejected because the question describes condensation on the surface. Memory cue: dew point plus above-freezing surface equals liquid dew; below-freezing conditions favour frost.

Related tags

DewDew PointFreezing PointSurface CondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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