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# Bernoulli's Principle Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. $\\bf{P + 1/2 \\rho V^2 + \\rho gh = constant}$ $\qquad P$ = Pressure $\qquad \\rho$ = Density $\qquad V...

# Bernoulli's Principle Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. $\\bf{P + 1/2 \\rho V^2 + \\rho gh = constant}$ $\qquad P$ = Pressure $\qquad \\rho$ = Density $\qquad V$ = Velocity $\qquad h$ = Height Bernoulli's principle can be used to compute the lift force on an airfoil if the behavior of the fluid flow in the vicinity of the foil is known. **Lift = $\\bf{P_b - P_t / A}$** $\qquad P_b$ = Pressure Below $\qquad P_t$ = Pressure Above $\qquad A$ = Area of the Wing **How Airplanes Fly** Airplanes fly due to the shape of their wings. Air is forced to travel faster over the top of the wing than underneath. Faster moving air means lower pressure. Lower pressure on top of the wing and higher pressure below the wing creates lift! ### Sources 1. Britannica, Bernoulli's principle URL: [https://www.britannica.com/science/Bernoullis-principle](https://www.britannica.com/science/Bernoullis-principle) 2. Wikipedia, Lift (force) URL: [https://en.wikipedia.org/wiki/Lift(force)](https://en.wikipedia.org/wiki/Lift(force))