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Question

The ratio of inertial forces to viscous forces is known as
  1. Coefficient of viscosity
  2. Reynolds number 
  3. Fluid compressibility
  4. None of these


Solution

The correct option is B Reynolds number 
Reynolds number is defined as the ratio of inertial forces to the viscous forces for a fluid.
Re=Inertial forceViscous force=ρvDη
where v Fluid velocity
η Fluid viscosity
D Diameter of flow conduit

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