A balloon filled with helium rises in air because

A balloon filled with helium rises in air because Correct Answer Helium is less dense than air

In the beginning the balloon filled with helium rieses in air because weight of the air displaced by balloon is more than the weight of the balloon and helium gas filled inside balloon. We know that the density of air and the value of acceleration due to gravity decreases with height.
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The helium-filled balloon -----.
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Helium gas is filled in balloons because
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A balloon lifting in air follows the following principle