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Why is water vapour not visible even when it is present in air?

Answer and explanation

Correct answer: Water vapour is transparent in the gaseous state

Correct answer: A. Water vapour is water in its gaseous state, and the gas is generally invisible because it does not scatter enough visible light for our eyes to see it. When vapour cools and condenses into tiny liquid droplets or ice particles, those particles can scatter light and become visible as cloud, fog or mist. B is wrong because vapour is a gas, not a solid. C is wrong because water vapour is present during both day and night. D is wrong because water vapour has mass, even though it is invisible. Do not confuse visible white ‘steam’ near hot water with pure vapour; the visible part is usually condensed droplets. Memory cue: invisible vapour, visible condensed droplets.

Related tags

GeographyWater VapourVisibilityCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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