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It's the water vapor in your breath, after it becomes liquid water.

Warmer air is able to hold more water vapor than cooler air. When you breathe

onto a cold surface, the air in your breath is cooled, and it can't then hold as much

water vapor as it did when it was warm. So some of the vapor condenses out ...

becomes water instead of vapor ... and the condensed water collects on the glass.

Exactly the same process is responsible when you exhale into cold air and you

"see your breath".

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14y ago

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