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How is the amount of water vapour in dry air?

Answer and explanation

Correct answer: Very low

Direct answer: B, very low. Dry air contains only a small amount of water vapour, so its humidity is low. Humidity means the amount of water vapour present in the air; it does not mean that the air contains liquid water. Air can hold different amounts of vapour depending partly on temperature, but the phrase “dry air” indicates that the vapour content is low. Step by step: first identify the key word “dry”; then connect dryness with little atmospheric moisture; therefore choose “very low.” A is wrong because a high amount of vapour describes moist or humid air. C is wrong because moderate means neither especially dry nor especially moist. D is wrong because fully saturated air contains the maximum vapour it can hold at a particular temperature and is not described as dry. Memory cue: dry means low moisture; humid means more moisture. Do not confuse invisible water vapour with visible liquid droplets.

Related tags

GeographyHumidityDry AirWater VapourAtmosphereEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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