"The gain in kinetic energy resulting from the increased linear velocity in the throat is offset (i.e., balanced) by the decrease of pressure in the throat. The reduction in pressure which occurs when the fluid flows through the throat is called the Venturi effect and is named after the Italian physicist Giovanni Battista Venturi (1746 - 1822) who first observed the effect."
http://en.citizendium.org/wiki/Venturi_effect
http://www.hippocampus.org/homework-help/P...Simulation.html
Andrew
