Torricelli's law and the Venturi effect result from this principle, a statement of the conservation of energy in a fluid.
This statement includes a term equal to the kinetic energy per unit volume, often called the "dynamic pressure". A law giving the speed of outflow for a hole in a tank a certain height above the ground is derived from this law, as is an effect in which pressure is lowered in a constricted section of pipe. (*) Torricelli's law and the Venturi effect result from this principle, a statement of the conservation of energy in a fluid. This principle explains why an increase in fluid speeds results in a decrease in pressure and is often falsely used to explain lift on airplanes. For 10 points, name this fundamental principle of fluid dynamics, named for a Swiss mathematician.
This statement includes a term equal to the kinetic energy per unit volume, often called the "dynamic pressure".
 Bernoulli's principle or law or equation or effect (or other reasonable equivalents)