A balloon filled with air does not fly whereas a balloon filled with helium gas can fly. Why?
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Answer:
helium and hot air are lighter than normal air that is why the helium and hot air balloon fly
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2
Answer:
Because helium is too much light gas which can fly easily with no efforts and it is lighter than air but if air is collected and filled in a balloon it will have its own weight and due to heaviness it will not fly .
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