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Why is water vapour called a variable gas?

Answer and explanation

Correct answer: Because its amount changes greatly with place and time

Direct answer: A is correct. Water vapour is called a variable gas because its concentration in the atmosphere changes greatly from place to place and from time to time. Evaporation from oceans, lakes, soil, and vegetation adds vapour, while condensation and precipitation remove it. Temperature also matters because warm air can generally hold more vapour than cold air. Therefore, humid coastal air, dry desert air, and air at different heights may contain very different amounts. A is correct because it states this changing distribution. B is wrong because water vapour is commonly present in the atmosphere. C is wrong because vapour is the gaseous form of water, although water can also exist as liquid or ice. D is wrong because water vapour strongly affects clouds, precipitation, and weather. Memory cue: permanent gases stay relatively stable; variable water vapour changes with moisture supply and temperature.

Related tags

Water VapourVariable GasHumidityWeatherEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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