Bernoulli's Principle

Bernoulli's Principle states that an increase an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.

Bernoulli's Energy Equation
$big=1$

This equation is true at every point in a flow as long as there are no losses or gains in fluid energy, however:
 * pumps add energy
 * turbines remove energy
 * pipes and bends have losses