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Air is called saturated at (100%) relative humidity, but what can happen to extra vapour?

Answer and explanation

Correct answer: It may condense or deposit

Direct answer: A, it may condense into liquid droplets or deposit directly as ice. Relative humidity compares the actual water-vapour content with the maximum amount the air can hold at that temperature. At 100% relative humidity, the air is saturated, so it cannot comfortably retain additional vapour under the same conditions. If extra vapour is added, or if the air cools further, water changes state. It may form liquid droplets through condensation, as in clouds, fog, or dew. At a temperature below freezing, vapour may change directly into ice crystals through deposition, as in frost. B is wrong because water vapour does not turn into nitrogen. C is unrelated to atmospheric moisture, and D is an impossible claim. Memory cue: saturation means the moisture limit; extra vapour must change state or conditions must change.

Related tags

SaturationRelative HumidityCondensationDepositionHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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