In a pipe of varying cross-section, as fluid enters the narrower region it exhibits:
Correct answer: B. High velocity, low pressure
- A. High velocity, high pressure
- B. High velocity, low pressure
- C. Low velocity, high pressure
- D. Low velocity, low pressure
Explanation
Continuity forces the speed up in the constriction, and since the total energy per unit volume is fixed, the gain in kinetic energy must be paid for by a drop in pressure energy. This pairing of fast flow with low pressure is the heart of Bernoulli's principle. A Venturi meter measures flow rate by reading exactly this pressure difference.
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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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