$P_{1} + \frac{1}{2} ρ v_{1}^{2} + ρ g h_{1} = P_{2} + \frac{1}{2} ρ v_{2}^{2} + ρ g h_{2}$

Essentially states that faster flowing fluids experience lower pressure
Only for low viscosity/laminar flow systems where conservation of energy applies
$P$ is the absolute pressure of the fluid
$ρ$ is the fluid density
$v$ is the fluid velocity
$g$ is the gravitational acceleration constant
$h$ is the fluid height above some reference point
$\frac{1}{2} ρ v^{2}$ is the dynamic pressure of the fluid
$P + ρ g h$ is the static pressure or gauge pressure of the fluid

Applications

Pitot Tubes
Venturi Flow Meter
Airfoils
- Airplane wing lift
- Automotive wing
  - Increases downforce for more normal force/traction
Spoiler
- Disrupts airflow over the top of the car to prevent lift from being generated by fast airflow over the top of the car and slow airflow at the bottom
Drafting
- Cars get sucked together due to airflow being faster between them (less area to travel through, which is the application of the continuity equation), so a lower static pressure is created between the cars