give the reason for rising of balloons in air
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Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
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Answer:
When a light gas like hydrogen or helium ( density much less than that of air ) is filled in a balloon, the weight of air displaced by the inflated balloon ( i.e., upthrust ) becomes more than the weight of the gas filled balloon and it rises up
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