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Conditions and Diseases
Evaporation and Condensation

Why does smoke come out of mouth when it is cold?


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2009-01-20 21:38:53
2009-01-20 21:38:53

"Smoke" does not come out of your mouth when it's cold. That's actually water vapor. This is because normal air that we breath everyday is partially composed of water vapor, however we don't see this vapor until the temperature drops (however the temperature at which we would see the vapor depends on the humidity of the air). So when that vapor goes from your warm lungs to the cold outside, it condenses and forms what looks like smoke.

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