It is the property of fluid to oppose the relative motion of between the adjacent layers. The opposition causes internal resistive force or frictional force known as viscous force or viscous drag. Consider a fluid flowing between two glass planes such that lower arc is fixed and upper one is moving with speed V. As result of the motion of upper surface, the shape of the fluid changes, as shown in figure from PQRS to P'Q'R'S' for an interval of time Dt.
The rate of change of shearing strains =
The SI unit of viscosity is poisele (PI).
The viscous force provided by fluid is
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