[A] If the buoyant force exerted by the air on a balloon is greater than the weight of the balloon
Meghna MittalBegginer
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A Balloon filled with a gas such as Hydrogen gas is much lighter in weight than the weight of air displaced by it. So the buoyant force exerted by the air on a balloon is greater than the weight of the balloon. The hydrogen gas which is lighter than air enables the balloon to float.