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[QUOTE=d1ck;349787]When you pinch off the end of a hose you're creating what's called a nozzle which reduces the cross sectional area which the water has to flow through. This is why the velocity increases. You can determine the velocity through a known opening by doing the following:
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Maybe I am wrong, but I beleive this is also called the "venturi effect"
not only does it create faster flow but it also increases the air pressure.
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