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What is the fog formed when vapour from a warm water surface meets cold air during winter called?

Answer and explanation

Correct answer: भाप कोहरा या स्टीम फॉग (Steam fog)

Correct answer: B, steam fog. A warm water surface supplies water vapour to the air immediately above it. If the overlying air is much colder, it cannot retain all that moisture as invisible vapour. The vapour condenses into very small liquid droplets, producing a visible fog that resembles rising steam. This commonly occurs over relatively warm lakes, rivers, or other water bodies when cold air moves across them. A is not the best answer because convective fog is a broader label associated with cooling and mixing processes and does not specifically identify vapour rising from warm water into cold air. C is wrong because orographic effects involve air being forced to rise over hills or mountains; ‘smoke’ is not the correct water-cycle term. D is wrong because dry fog is not the standard name for this warm-water/cold-air condensation process. Do not confuse steam fog with steam itself: steam fog is made of tiny condensed liquid droplets suspended in air. Memory cue: warm water plus cold air equals steam fog.

Related tags

Steam FogFogCondensationWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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