ANSWERS: 3
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Your breath has moisture (water vapor) in it. When you exhale into very cold outdoor air, the moisture-laden atmosphere from your lungs becomes chilled to the point where the water condenses into a fog.
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For the very same reason you see clouds. It's moisture that's much warmer than its surroundings.
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Yes, your breath condenses into a gas, and you can see it in very cold weather.
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