Why does the balloon rise up when the air inside it heats up?

Hot air is much lighter than cold air, which is why rain (air in a liquid state) falls to the ground, and steam (air in a gaseous state) rises to the ceiling, which is why it can be very hot in the kitchen during cooking just under the ceiling. And if you heat the air inside the balloon, then it will become much lighter and thanks to this it will be able to take off.



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