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Why is rapid cooling of the ground surface important for dew?

Answer and explanation

Correct answer: Because air near the surface can reach dew point

Correct answer: A. Air can hold water vapour, but the amount it can hold depends strongly on temperature. When the ground surface cools rapidly, the thin layer of air touching or lying close to it also cools. If this air reaches its dew point, it becomes saturated; further cooling causes some water vapour to condense into liquid droplets on the surface. These droplets are dew. Rapid cooling is therefore effective because it can bring the near-surface air to saturation before winds mix it with warmer air above. Option A is correct. Option B is wrong because cooling does not make air completely dry. Option C is wrong because water vapour changes form rather than ending. Option D is wrong because dew formation does not increase ocean water. Memory cue: cool surface, cool nearby air, reach dew point, then droplets form.

Related tags

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

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