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by changing the temperature and volume of air in the balloon - using a gas burner to heat the air makes the ballon rise - to descend air is let out of the balloon making it heavier - the ballon can stay up as long as there is gas to heat the air (as eventually the air will cool to the outside air temperature) - so flying a balloon is a balance between heating the air and letting air out - horizontal speed and direction is contolled by finding an altitude that has wind blowing in the direction you want to go

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13y ago

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