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What is more likely if air temperature falls below the dew point?

Answer and explanation

Correct answer: Condensation

Correct answer: A, condensation. The dew point is the temperature to which air must be cooled for it to become saturated with its existing water vapour, assuming the pressure and moisture content are considered appropriately. If the air cools to or below this point, it cannot hold all the vapour in the gaseous form. The excess vapour changes into tiny liquid droplets or, under freezing conditions, ice. This is condensation and may contribute to dew, fog or clouds. B is wrong because cooling below the dew point does not produce a sharp rise in evaporation; it favours condensation. C is wrong because humidity is not absent; the air has enough moisture to reach saturation. D is wrong because transparency is not the defining result. Memory cue: reaching the dew point means vapour begins to leave the air as droplets.

Related tags

GeographyDew PointCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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