Definition
Bernoulli’s Principle states that where the speed of a fluid increases, the internal pressure in the fluid decreases.
Why It Matters
It is the reason why planes fly, sails work, and chimneys draw smoke. This fundamental link between fluid speed and pressure is the physical magic that makes modern transportation and infrastructure possible.
Core Concepts
- Fluid Speed and Pressure: Fast-moving fluids exert less lateral pressure than slow-moving fluids.
- Streamlines: Thin lines representing the smooth path of a fluid. Where streamlines are closer together, fluid speed is higher and pressure is lower.
- Pascal’s Principle (Contrast): While Pascal’s Principle deals with pressure in enclosed fluids at rest, Bernoulli’s Principle deals with pressure in flowing fluids.