Question

2. Hot air rises up and cold air comes down.
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Answer 1

Answer:

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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Answer 2

Answer:

Warm air rises when it's surrounded by cold air because of its lower density. Yes, that's due to heat, but density is the main factor causing the movement here. The name for this phenomenon is stack effect.

Explanation:

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