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Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not?

A.Helium has no mass, but air does.
B.Helium increases the balloon's mass more than air.
C.Helium has a higher density than air.
D.Helium has a lower density than air.
Answer- D

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Answer:

D why that as the oil and the water

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