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Why are clouds visible while water vapour is invisible?

Answer and explanation

Correct answer: Because clouds are made of condensed droplets or ice crystals

Answer: A, because clouds contain condensed droplets or ice crystals. Water vapour is water in its gaseous state, and individual water molecules are too small to be seen with the naked eye. When moist air cools and reaches suitable conditions, vapour condenses onto tiny particles or freezes, forming countless small liquid droplets and ice crystals. These particles scatter sunlight, so the group becomes visible as a cloud. A is correct because it distinguishes invisible vapour from visible condensed particles. B is wrong because water vapour is not black; its invisibility is due to its gaseous molecular scale. C is wrong because clouds are not rocks. D is wrong because ordinary air is also invisible; the visible appearance comes from particles within the cloud scattering light. Memory cue: invisible vapour becomes a visible cloud after condensation or freezing.

Related tags

Cloud VisibilityWater VapourCondensationIce CrystalsClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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