# Bernoulli’s Equation

As a fluid moves through a region where its speed and/or elevation above the Earth’s surface changes, the pressure in the fluid varies with these changes

$21 ρv_{1}+ρgh_{1}+P_{1}=21 ρv_{2}+ρgh_{2}+P_{2}$

where

- $P$ is the pressure area (1st group)
- Kinetic energy per unit volume (2nd group)
- Potential energy per unit volume (3rd group)