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Heat itself is a form of energy. This gives the air molecules more kinetic energy. Thus, with more kinetic energy, the air molecules move a lot more. Adversely, in cold air, there is less energy, thus the air molecules move less slowly. This is what gives hot air more volume than cold air.

(Yeah I know I used more commas than I should've.)

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16y ago

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Is hot air liter or heavier than cold air?

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