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Why is a calm night helpful for dew?

Answer and explanation

Correct answer: Cool, moist air can remain near the surface

Correct answer: A. During a clear, calm night, the ground and other exposed surfaces can lose heat and become cool. When wind is weak, the air close to the surface is not rapidly mixed with warmer air above it. Moist air can therefore remain near the cool surface. If this air cools enough, its water vapour condenses into liquid droplets, producing dew. A is correct because it describes why calm conditions support the process. B is wrong because dew requires moisture; removing all moisture would prevent dew. C is wrong because air does not become stone. D is wrong because the Sun is not stronger at night and nighttime cooling is important. Calm does not create dew by itself; suitable moisture and cooling are also needed. Memory cue: calm air lets cool, moist air stay close to the ground.

Related tags

DewCalm NightSurface CoolingMoistureForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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