Flow & Bernoulli

Faster flow, lower pressure

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Continuity: $A_1v_1 = A_2v_2$. Narrower pipes mean faster flow.
• Bernoulli: faster flow means lower pressure ($P + \tfrac12\rho v^2 + \rho g h$ is constant).
• Wings make lift by turning air downward. The “equal transit time” story is a myth.

Steps

1. Thumb on the hose
2. The continuity equation
3. Bernoulli’s principle
4. Blow between them
5. A narrower pipe
6. A popular myth