What is Bernoulli's equation? Bernoulli's equation is a relationship between pressure and velocity at different parts of a moving incompressible fluid. The following two assumptions must be met for this Bernoulli equation to apply: the flow must be incompressible – even though pressure varies, the density must remain constant along a streamline friction by viscous forces has to be negligible. Bernoulli's principle- Bernoulli's principle states that for a incompressible, streamline and non viscous fluid, the work done by the pressure difference per unit volume plus the kinetic energy per unit volume plus the potential energy per unit volume is a constant. Work done = Force ∗ distance Force = Pressure ∗ Area. Thus, Work = Presssure ∗ Area ∗ distance. Thus, Work = Pressure ∗ Volume. Therefore, the work done per unit volume = Pressure. Kinetic energy = 1/2 ∗ mass ∗ velocity 2 Therefore, kinetic energy per unit volume = 1/