A Venturi meter measures the rate of flow of a fluid by using
Correct answer: B. the pressure difference between a wide section and a narrow section
- 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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About Bernoulli's Equation
Bernoulli’s equation applies conservation of energy to steady flow of an incompressible, non-viscous fluid along a streamline: pressure, kinetic and gravitational terms have a constant total. It explains pressure-speed changes in narrow pipes, Venturi meters and lift, and differs from continuity because it relates pressure as well as velocity and height.
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