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Bernoullis principle

Bernoullis principle

The concept that as the speed of a moving fluid (liquid or gas) increases, the pressure within that fluid decreases. The total energy in a steadily flowing fluid system is a constant along the flow path. An increase in the fluids speed must therefore be matched by a decrease in its pressure. Applies in nozzles, where flow accelerates and pressure drops as the tube diameter is reduced. It is also the principle behind orifice or Venturi flow meters. These meters measure the pressure difference between a low-speed fluid in an approach pipe and the high-speed fluid at the smaller orifice diameter to determine flow velocities and thus to meter the flow rate. (099)