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Why do clothes dry faster in sunlight?

Answer and explanation

Correct answer: Sunlight increases evaporation

Evaporation is the change of liquid water into water vapour from its surface. Heating gives water molecules more energy, so more of them can escape into the air. Sunlight usually warms the clothes and the water held in them, increasing the rate of evaporation. Air movement and a larger exposed surface can also help, but the reason directly stated in the options is the warming effect of sunlight. Dry clothes result when water vapour leaves the fabric and mixes with the surrounding air.

Option C is correct because sunlight generally raises temperature and thereby increases evaporation. Option A is wrong because ordinary sunlight does not freeze the water. Option B reverses the process: moving air is not stopped by sunlight, and air movement often assists drying. Option D is also wrong because sunlight does not simply add moisture to the clothes. Thus, under comparable conditions, clothes dry more quickly in sunlight because heat speeds the liquid-to-vapour change.

Related tags

SunlightEvaporationDrying

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