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Warm air rises because it is less dense than cold air.

Kinetic molecular theory tells us that warmer particles move faster than colder particles. (That's how we define a substance to have "heat".) You can imagine that faster particles are going to bump into each other more often, pushing other particles away.

So, yes. Warmer = less dense = rising. In all things.

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Waldo Mayer

Lvl 13
3y ago

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