CHAPTER-OPENING QUESTION—Guess now!
A hot-air balloon, open at one end (see photos above), rises when the air inside is heated by a flame. For the following properties, is the air inside the balloon higher, lower, or the same as for the air outside the balloon?
- (i) Temperature
- (ii) Pressure,
- (iii) Density.
Return to the Chapter-Opening Question, page 454, and answer it again now. Try to explain why you may have answered differently the first time.
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