Physics › Section H · Fluids › Topic H.5
Flow rate and continuity
Water racing out of a hose nozzle, a river slowing as it widens into a lake and blood creeping through capillaries all follow one rule: for a liquid, whatever flows in must flow out. This topic turns that rule into the continuity equation.
In this topic
- From still fluids to moving ones
- Volume flow rate
- Flow rate and speed: Q = Av
- Worked example: filling a paddling pool
- The continuity equation
- Worked example: a hose nozzle
- Continuity in everyday life
- Branching flows
- Worked example: from aorta to capillaries
- What about gases?
- Common mistakes to avoid
- Key takeaways
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