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When fluid is incompressible, it means:

Correct answer: D. Its density remains constant

  • A. No internal frictional force
  • B. Independent of coordinates
  • C. Independent of time
  • D. Its density remains constant
  • E. Its density remains variable

Explanation

The correct answer is Its density remains constant. This is the characteristic of an incompressible fluid. The density of an incompressible fluid does not change with pressure or temperature. This means that the volume of an incompressible fluid will not change if it is compressed or expanded.

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About Fluid Dynamics

Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.

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