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What does relative humidity show?

Answer and explanation

Correct answer: Ratio of actual water vapour to maximum capacity

Direct answer: A, the ratio of actual water vapour to the maximum amount the air can hold at that temperature. Relative humidity is usually expressed as a percentage: actual water vapour divided by saturation capacity, multiplied by 100. For example, 50% means the air contains about half of the vapour needed for saturation under those conditions. B is wrong because wind speed describes moving air, not moisture content. C is wrong because height or elevation is a characteristic of land and does not define relative humidity. D is wrong because cloud colour is not used in the calculation. A is correct because relative humidity tells us how close air is to saturation. Since warm air can hold more vapour, relative humidity can change when temperature changes even if the actual vapour amount remains the same. Memory cue: relative humidity means ‘how full of vapour is the air?’

Related tags

Relative HumiditySaturationHumidity PercentageWater VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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