What are the basic steps in hot air balloons functioning?


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Ray Dart answered

The trick is to fill a nylon or polyester envelope with about 4 tons of air and then heat it until it expands, You can get rid of about one and a half tons of air doing that. You now have an envelope that weighs considerably less than the surrounding air and hence it tries to float upwards, carrying whatever is attached to it upwards at the same time.

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