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xkcd #3044: Humidifier Review
(xkcd.com)
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Ok Mr Snarky pants...
Where do you think it goes?
Into the air. Which results in the air having more water in it, ie. more humidity.
Steam is not humidity.
If there's no puddle forming around the humidifier, doesn't that mean all the water is dissolved in the air? Where else could it go?
The steam condenses into vapour when it comes into contact with the ceiling, walls, and windows.