English Wikipedia article English English http://en.wikipedia.org/wiki/Orifice_plate Orifice http://en.wikipedia.org/wiki/Orifice_plate English Full article >>> http://en.wikipedia.org/wiki/Orifice_plate square-root of pressure, because of energy balance English Orifice http://en.wikipedia.org/wiki/Orifice_plate fairly straightforward to calculate en.wikipedia.org/wiki/Orifice_plate http://en.wikipedia.org/wiki/Orifice_plate English Full article >>> English