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maleitch 1 point ago +1 / -0

Caused by the difference in temps of the hot breath. Yes.

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djcalligraphy [S] 1 point ago +1 / -0

That's not what it is. When air is cooled beyond dew point, the water vapor begins to turn back into liquid. When you see your breath, you're seeing the the water particles freeze and then turn to liquid