Hot air is less dense than cold air. Could a hot-air
Chapter 10, Problem 7MCQ(choose chapter or problem)
Problem 7MCQ
Hot air is less dense than cold air. Could a hot-air balloon be flown on the Moon, where there is no atmosphere?
(a) No, there is no cold air to displace, so no buoyancy force would exist.
(b) Yes, warm air always rises, especially in a weak gravitational field like that of the Moon.
(c) Yes, but the balloon would have to be filled with helium instead of hot air.
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