A Venturi meter measures the rate of flow of a fluid by using
- A. the temperature rise in a constriction
- B. the pressure difference between a wide section and a narrow section
- C. the weight of the fluid
- D. the colour change of the fluid
Explanation
The fluid speeds up in the throat, so its pressure falls, and measuring that pressure drop with a manometer gives the speed through the continuity and Bernoulli equations. Because it has no moving parts it is reliable and causes little permanent pressure loss. The same principle drives a carburettor and a filter pump.
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