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The amount of moisture - water vapour, that air can carry without the water condensing - turning into droplets, depends on the temperature. Exhaled air has a fair bit of moisture in it that it has picked up from the lungs and the airways. If you exhale when it's warm, that moisture stays suspended in the air, and you don't see it. If you exhale when it's cold, the moisture condenses into tiny droplets, which you see as fog.

Pretty much the same as when beads form on a cold glass or bottle or soda can. Or why a mirror steams over when you breathe on it.

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11y ago

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