Viscosity

Viscosity characterizes the degree of internal friction in the fluid

• This internal friction, viscous force, is associated with the resistance that two adjacent layers of fluid have to moving relative to each other
• It causes part of the kinetic energy of a fluid to be converted to internal energy

$F=\mu A\frac{u}{y}$ $F$ = force $\mu$ = viscosity of the fluid $A$ = area of each plate $\frac{u}{y}$ = rate of shear deformation