Physicsmedium · Past Paper
A balloon filled with hydrogen gas rises in the air because:
AHydrogen is very light
BThe weight of the balloon is less than the upthrust of the air
CGravity does not act on hydrogen
DHydrogen reacts with air
✓ Correct Answer: B — The weight of the balloon is less than the upthrust of the air
A balloon rises when the upthrust (weight of the air displaced) is greater than the total weight of the balloon and gas.
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