Newton studied the viscous force acting between two layers of liquid assuming it flow to be laminated and found that It is directly proportional to the area of layers in contact. i.e.F∝A…(i) i.e.F∝A…(i) It is directly proportional to the velocity gradient between the layers FF∝Advdx where the constant of proportionality'η' is known as the coefficient of viscosity of a liquid. Hence, coefficient of viscosity of a liquid is defined as the viscus drag or viscus force acting per unit area of the layer having unit velocity gradient perpendicular to the direction of the flow of the liquid .Learn More
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