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Why can a cloudless night be useful for dew formation?

Answer and explanation

Correct answer: The ground can cool more by radiation

Correct answer: A. During a clear, cloudless night, the ground can lose heat by radiation to the atmosphere and space without much cloud cover returning or absorbing that outgoing energy. As the surface cools, the air immediately above it also cools. If that air contains moisture and reaches its dew point, water vapour condenses into liquid droplets on grass, leaves, roofs, or other cool surfaces. A is correct because enhanced night-time radiational cooling helps the surface reach the temperature needed for dew. B is wrong because the surface generally cools at night rather than becoming hotter through this process. C is wrong because water vapour does not disappear; some of it changes into liquid water. D is wrong because salt in the air is not the basic cause of ordinary dew. Memory cue: clear sky allows heat to escape, so clear nights favour dew when moisture is available.

Related tags

DewCloudless NightRadiational CoolingCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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