Question

Hydrogen filled balloons fly up in the air.Give reason?​

Answer 1

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Hydrogen is lighter than air. The upthrust or buoyant force acting on the balloon filled with hydrogen gas is more than its weight. So it floats in air.

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Answer 2

Answer:

Hydrogen is lighter than air. The upthrust or buoyant force acting on the balloon filled with hydrogen gas is more than its weight. So it floats in air.