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Above: As air is removed from the bottle, the balloon expands. What makes this happen? The tube indicated by the yellow arrow is open, but the balloon does not deflate. Why not?
Left: Notice what happens to the paper when the glass is turned upside-down. What makes this happen?
[some additional questions for jump-starting position-driven discussions:
Which is "heavier"--water or air? Water or paper? Paper or air?
Does "heaviness" have a direction?]
What makes the egg go into the bottle?