Solved: In hot-air ballooning, a large balloon is filled

Chapter 12, Problem 6DQ

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QUESTION:

In hot-air ballooning, a large balloon is filled with air heated by a gas burner at the bottom. Why must the air be heated? How does the balloonist control ascent and descent?

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QUESTION:

In hot-air ballooning, a large balloon is filled with air heated by a gas burner at the bottom. Why must the air be heated? How does the balloonist control ascent and descent?

ANSWER:

Solution 6DQ

Hot air has a density lower than air at normal temperature. With an increase in temperature of air,  its density decreases. Thus hot air will tend to rise above normal temperature air and for this reason the air of the balloon is heated.

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