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How are clouds visible even though water vapour is invisible?

Answer and explanation

Correct answer: Because clouds consist of tiny liquid droplets or ice particles

Correct answer: A. Water vapour is water in the gaseous state, and individual vapour molecules are too small to scatter enough visible light for us to see them. When moist air cools, some vapour condenses into countless tiny liquid droplets; in sufficiently cold conditions, ice particles may form. These droplets and ice particles scatter and reflect sunlight, so the collection becomes visible as a cloud. A is correct because a cloud is made mainly of suspended condensed water droplets and/or ice particles. B is wrong because water vapour is colourless, not a coloured gas. C is wrong because dust may help condensation, but clouds are not merely dust. D is wrong because humidity does not produce light; visibility comes from light interacting with water or ice particles. Memory cue: invisible vapour, visible droplets.

Related tags

Water VapourCloudsCondensed DropletsClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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