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Water vapour is colourless, so how is it generally identified?

Answer and explanation

Correct answer: By effects of humidity and condensation

Correct answer: A. Individual water-vapour molecules are colourless and invisible, so water vapour itself cannot normally be identified simply by looking at it. We infer its presence from measurable humidity and from visible effects produced when it condenses. For example, cooling can change vapour into tiny liquid droplets or ice crystals, producing clouds, fog, dew, or frost. Option A is correct because humidity indicates the amount of vapour and condensation makes moisture visible. Option B is wrong because vapour has no visible colour of its own. Option C is unrelated to atmospheric water vapour. Option D is wrong because soil smell is not a reliable general method for identifying vapour. Memory cue: invisible vapour is known by its measurements and its condensation products, not by colour.

Related tags

GeographyWater VapourHumidityCondensationVisibilityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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