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Before dew formation what change occurs in the nearby surface?

Answer and explanation

Correct answer: Surface cools near the dew point

Direct answer: B, the surface cools to near the dew point. At night, an exposed surface can lose heat. The air immediately touching or lying close to that surface also cools. When the surface and nearby air become sufficiently cool, the air reaches saturation, and water vapour changes into liquid droplets on the surface. This deposit is dew. B is correct because it identifies the essential temperature change before condensation. A is wrong because heating increases evaporation and makes dew less likely, and burning is unrelated. C is wrong because no transformation of the surface into a sea is needed. D is wrong because gravity does not disappear and is not the controlling condition for dew. The exact temperature depends on moisture content, so a moist night is more favourable than a dry one. Memory cue: dew begins after surface cooling, not heating; cool surface plus moisture produces droplets.

Related tags

DewSurface CoolingDew PointCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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