Physics › Section H · Fluids › Topic H.7
Viscosity, Poiseuille's law, and turbulence
Real fluids are sticky: syrup pours slowly, and water needs a push to flow along a pipe. Viscosity measures that stickiness, Poiseuille's law shows how strongly a tube's width controls flow, and the Reynolds number predicts when smooth flow breaks into turbulence.
In this topic
- Fluids with friction
- Measuring viscosity
- Viscosity and temperature
- Pressure drives flow against resistance
- Poiseuille's law
- Worked example: a slightly narrower artery
- Worked example: a thin tube
- The Reynolds number
- Worked example: laminar or turbulent?
- Objects moving through a fluid
- Common mistakes to avoid
- Key takeaways
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