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Why can humidity gradually increase if an open bucket of water is kept in a closed room?

Answer and explanation

Correct answer: Because evaporation adds water vapour to room air

Answer: A. An open bucket exposes a water surface to the room air. Some water molecules continually escape from that surface by evaporation and mix with the air. Because the room is closed or poorly ventilated, the added vapour is not rapidly removed outdoors, so the actual moisture content and often the relative humidity gradually increase. The increase may slow as the air approaches saturation, and temperature changes can also affect relative humidity. A states the main process. B is wrong because evaporation adds water vapour, not by simply removing oxygen. C is false; a closed room does not force its temperature to zero. D is wrong because increased humidity does not cause immediate rainfall indoors; condensation requires cooling to saturation and suitable surfaces or droplets. Memory cue: open water plus limited ventilation increases room moisture.

Related tags

Indoor HumidityEvaporationWater SurfaceHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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