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Why is water vapour in air not visible?

Answer and explanation

Correct answer: Because it is in the gaseous state

Direct answer: A is correct. Water vapour is water in the gaseous state. Individual gas molecules are extremely small and spread through the air, so ordinary eyes cannot see them. When moist air cools, the vapour may condense into many tiny liquid droplets or ice crystals; these groups can scatter light and become visible as clouds, fog, or mist. A is correct because it identifies the physical state of invisible water vapour. B is wrong: water vapour is not always black, and its colour is not the reason it is invisible. C is wrong: water vapour does not become soil; soil is made from mineral particles, organic matter, air, and water. D is wrong: water is not a metal. Memory cue: invisible vapour is a gas, while visible clouds are condensed droplets or ice crystals.

Related tags

GeographyWater-VapourGas-StateHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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