A balloon filled with hydrogen rises in air because hydrogen has:
AHigher density than air
BSame density as air
CLower density than air
DMore molecules than air
Answer & Solution
Correct answer: C. Lower density than air
1. Hydrogen has the lowest density of any gas.
2. Density at standard conditions is about 0.09 kg per cubic metre.
3. Air density is about 1.2 kg per cubic metre.
4. Less dense gas experiences upward buoyancy in air.
5. So a hydrogen balloon rises.
_Source: Selina Concise Physics ICSE Class 8, Ch 1 'Matter'_
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