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Sticky Note
The Bernoulli's equation relates the pressure, velocity, and height of a fluid in a streamline. Which of the following assumptions is NOT made in the derivation of Bernoulli's equation?
  1. Steady flow
  2. Incompressible fluid
  3. No external forces acting on the fluid
  4. Negligible viscosity
Explanation

The assumption that is NOT made: "No external forces acting on the fluid"

  • Bernoulli's equation requires gravity to be present and acting on the fluid.
  • The height/head term (ρgh) in the equation is derived from the work done by gravity. Without gravity, this term would not exist.

Additional information

  • Steady flow — Properties at any point stay constant over time.
  • Incompressible fluid — Density (ρ) is constant.
  • Negligible viscosity — The fluid is inviscid/frictionless, so no shear forces or turbulence along the streamline.

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