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Warmer air can hold a lot more water in vapour form than cold air. You can extract the water by providing a cold surface for it to condense onto, like when water droplets form on a cold glass of water, in a warm humid room. This is how air conditioners work, the air temperature is brought right down to condense the water vapour out of the air, then the less humid cold air is sometimes warmed up again to give warm but dry air.

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How does water vapor come out in the air?

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When molecules of water vapor collide and stick together in the air?

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