According to Bernoulli's principle, where the speed of a fluid is high, its pressure is
Correct answer: B. low
- A. high
- B. low
- C. unchanged
- D. zero
Explanation
Since the total energy per unit volume is fixed, any gain in kinetic energy must be paid for by a fall in pressure energy. This is why a shower curtain is pulled inwards by the fast moving water stream and why two ships moving side by side are drawn together. The effect is easy to state and easy to misremember, so it is heavily tested.
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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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