alleryWhat gives lift to a hot air balloon?
ABurning hydrogen
BA spinning rotor
CHeated air
DSteam jets
Answer & Solution
Correct answer: C. Heated air
1. Hot air balloons are aerostats.
2. They gain lift from heated air, which is lighter than the surrounding air.
3. They do not use rotors or steam jets, and burning hydrogen is avoided as it is flammable.
_Source: Wikipedia, Transport: Air_
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