Explanation: Viscosity: The property that represents the internal resistance of a fluid to motion (i.e. fluidity) is called viscosity. There are two types of viscosity: Dynamic viscosity: It is the property of a fluid which offers resistance to the movement of one layer of fluid over an adjacent layer of the fluid. ● Its SI unit is N−s∕m2 or Pa−s. ● Its C.G.S unit is Poise. ● 1 Poise =0.1Pa−s=0.1Ns∕m2 Kinematic Viscosity: The ratio of dynamic viscosity to density appears frequently and this ratio is given by the name kinematic viscosity. Kinematic Viscosity (γ)=
Dynamicviscosity(μ)
density(ρ)
● Its SI unit =m2∕s. ● Its C.G.S unit = Stoke or cm2∕s. ● 1 Stoke =10−4m2∕s.