Hot air is __________ and it rises up.
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Heated air expands and becomes much lighter so it goes up.
It is stated that the warm air rises up and the colder air comes down. this happens because the warmer air becomes light and it is the property of the light air to go up. Whereas, the cold air goes down because it is heavy. The warm air jiggles and expands.
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Hot air does rise, but it doesn't have anything to do with getting closer to the Sun. Hot air rises because gases expand as they heat up. When air heats up and expands, its density also decreases. The warmer, less dense air effectively floats on top of the colder, denser air below it.
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