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Which condition helps in dew formation?

Answer and explanation

Correct answer: Clear sky and calm air

Correct answer: A, clear sky and calm air. At night, a clear sky allows the ground and plant surfaces to lose heat by radiation. Calm air prevents strong mixing with warmer air above and lets a shallow layer of moist air remain near the cooling surface. If that air cools to its dew point, water vapour condenses as liquid droplets. A strong dust storm increases turbulence and adds particles, so it is not the usual favourable condition. A very hot surface keeps moisture in vapour form rather than allowing droplets to condense. Completely dry air lacks sufficient water vapour, so it cannot readily produce dew. The memory cue is “clear, calm night, cool surface, morning dew,” although dew also depends on the presence of moisture and suitable cooling.

Related tags

DewClear SkyCalm AirRadiational CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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