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Why can two unsaturated air masses sometimes form fog after mixing?

Answer and explanation

Correct answer: Because the mixed air can reach saturation through a new balance of temperature and moisture.

The correct answer is A. Unsaturated air is not moisture-free; it simply contains less water vapour than the maximum possible amount at its current temperature. Two air masses may have different temperatures and moisture contents. After mixing, the resulting air has a new temperature and a combined moisture content. In some situations, this mixture reaches saturation even though each original air mass was individually unsaturated. Once saturation is reached, the excess water vapour condenses on tiny particles in the air and produces fog droplets. A correctly describes this special mixing-fog mechanism. B is wrong because unsaturated air still contains water vapour. C is wrong because ordinary mixing does not make pressure zero; pressure is not the essential explanation. D is wrong because fog is a visible collection of tiny water droplets and therefore requires moisture. The exact result depends on the temperature and moisture properties of both air masses, so mixing does not always produce fog. Memory cue: two individually unsaturated samples can cross the saturation limit when combined.

Related tags

Mixing FogSaturationCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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