McGuffey's Fifth Eclectic Reader Revised Edition Lesson 73: The Examination.
"Oh! I see now as plain as day; the cold air settles down all round, like the iron box, and drives up the hot air as fast as the fire heats it, in the middle, like the water; and so the hot air carries the smoke along up with it, just as feathers and things in a whirlwind."
This lesson in the McGuffey's Fifth Eclectic Reader Revised Edition, discusses about how the heated air rises, and why so. It is because the hot air has molecules move at a quicker rate, which makes it lighter then cold air, which is denser making it heavier.
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This image is from the book "Moonlight above the clouds". It shows the balloon almost crashing into the train* |
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