Question

why does hot air rise short answer
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Answer 1

Explanation:

So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used in the hot air balloons.

Answer 2

Explanation:

because when a substance is hot, its molecules are farther apart, which makes the hot air less dense and therefore, lighter than cooler air.