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Why is dew formation difficult if air is very dry?

Answer and explanation

Correct answer: Because dry air lacks sufficient water vapour

Answer: A. Dew requires two basic conditions: enough water vapour in the air and cooling of a surface until the nearby air reaches its dew point. Very dry air contains little water vapour, so even if a surface cools at night, there may not be enough moisture to condense into visible droplets. B is wrong because dry air generally has a lower dew point, not a high one. C is wrong because dew formation depends on cooling, not on dry air raising the surface temperature. D is wrong because dry air still has atmospheric pressure. The important idea is that cooling alone is insufficient; moisture must also be available. Memory cue: no moisture, no visible dew.

Related tags

Dew FormationDry AirWater VapourDew PointCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The Atmosphere

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