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Air can solve a certain amount of water. The warmer the air, the more water it can solve; the colder, the less. If the window's glass gets cold, it will also cool the air that is directly around it, so that air will be able to solve less water. If the air gets too cold and the amount of water it can solve drops below how much water is already solved, then the excess water will condensate on the glass, fogging it up. That's also why heating the glass will cause the fog to disappear. As it gets warmer, the air will be able to solve the water again and so it will.

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15y ago

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