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Not too long ago, or so it seems to me, I saw a demonstration for fluid
dynamics mentioned in the literature.
The demonstration had a straw placed vertically in a bowl of water, and
you blew through a horizontal straw across the top of the vertical one.
With soem practice, and lots of lung power, you could get te fluid to
rise in the vertical straw. Knowing how high the fluid rose, you could
calculate the velocity of the air you were blowing across the vertical
straw...