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What is the main process behind water droplets forming on grass after strong radiational cooling on a clear night?

Answer and explanation

Correct answer: Dew

Direct answer: A, dew. On a clear night, the ground and grass can lose heat by emitting long-wave radiation to the atmosphere and space. If the grass surface cools to or below the dew point while the air contains moisture, water vapour condenses into liquid droplets on the grass. This surface deposition is called dew. B, frost, would be the better answer if the water formed as ice crystals under freezing conditions, rather than as liquid droplets. C, fog, is made of droplets suspended in air near the ground, not droplets deposited on grass. D, mist is also an airborne collection of fine droplets, generally less dense than fog. Thus the clues “grass surface,” “water droplets,” and “night-time cooling” point to dew. Memory cue: dew is surface condensation in liquid form; frost is surface deposition in ice form.

Related tags

DewRadiational-CoolingCondensationGrassForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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