The Bernoulli principle, named after Swiss scientist Daniel Bernoulli, is a fundamental concept in fluid dynamics that describes the behavior of fluids, particularly in relation to their flow and pressure.

The Bernoulli principle is often expressed as Bernoulli's equation, which states that, in a steady flow of an incompressible and non-viscous fluid, the sum of the pressure energy, kinetic energy, and potential energy per unit volume is constant at any point.