Question

Why does a rubber balloon filled with hydrogen gas rise up towards the
sky ? Will it continue to rise up indefinitely ? Justify your answer
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Answer 1

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Because hydrogen gas is lighter than air. so balloon filled with hydrogen is also lighter than air and rises up.

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Answer 2

The rubber balloon filled with H2 gas will rise in the atmosphere due to the buoyant force applied by air on it.

The mass of a certain volume of hydrogen gas is much lesser than an equal volume of air, so the net force is (buoyant force-weight of balloon) acting in the upward direction, hence the balloon rises upwards into the air.

The balloon continues to rise up into the sky until the weight of the balloon is equalized by the buoyant force at that height in the sky OR the weight of the air displaced by the balloon becomes equal to the actual weight of the Hydrogen filled in the balloon.

As, air becomes less dense as we go up due to the gravitational force of attraction, hence the volume of air displaced by the balloon has a weight that keeps becoming lesser and lesser as the balloon moves up, eventually it equalizes the weight of the balloon and that is when it stops rising.