Definition of Viscosity: It is the property of a fluid that opposes the relative motion between its adjacent layers. This property of the fluid is known as viscosity. It is also called the resistance of fluid to flow or deformation or fluid thickness. Effect of temperature on Viscosity: The viscosity of the fluid decreases sharply with the temperature rise and becomes zero at boiling temperature. On the other hand, the viscosity of the gases increases with the temperature rise. Definition of Viscous Force (Internal Frictional Force): When a layer of fluid slide over another layer of the same fluid then an internal tangential frictional force act between them which opposes the relative motion between the layers. This tangential force is called viscous force or internal frictional force. In the absence of external force, the viscous force would soon bring the fluid to rest. Factor affecting the viscous force: There are the following factors that affect the v
(The Advance Learning Institute of Physics and Technology)