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Viscosity: Dynamic viscoscity & kinematic viscoscity,viscoscity index.

viscosity: resistance of fluid to change its shape,due to the intermolecular forces causing a frictional drag effect.
Absolute or dynamic viscosity= force to shear a fluid of area 1 m2 over another fluid of area 1m2 at the rate of 1m/s when the distance between two is 1 m.

kinematic viscosity is the ratio of absolute viscosity to the density of the same fluid at that temperature.
viscosity index-a value showing the ability of fluid to resist change in viscosity wrt change in temperature. a high viscosity index show high resistance
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