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Originally Posted by TheSilentChamber
In an enclosed area there is a point at which the speed of the air (or whatever) will become so turbulent that it starts to restrict itself. But I'm not sure if thats what your asking or not.
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And wouldn't that velocity be dependent on the size of the cross-section? Shouldn't a cross-section with a smaller area be more sensitive to velocity as compared to a section with a larger area?