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Simon Bridge
Nov15-12, 02:07 AM
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What you have answered is what height column of water would balance a given pressure difference.

There are additional constraints if you are thinking of a human sucking on the end ... like the capacity of the lungs. How long would it take for a human to suck up a 10m column of air through a straw? Against the resistance of having to pull up that mass of water?

Then I'd want to ask if the human lungs could do that much work - I suspect that will be the limiting factor. You'll find that the area of the straw matters ... compare sucking through a drinking straw and a hose pipe.