A Review on Effect of Viscosity on Liquids, Gases and Solid

Abstract

The viscosity is a measure of its resistance to deformation of a liquid at a given rate and corresponds to thickness [1] Viscosity can be conceptualized as quantifying the frictional force that arises between adjacent layers of fluid that are in relative motion. Experiments show that some stress is needed to sustain the flow of the liquid. This is because a force is required to overcome the friction between the layers of the fluid which are in relative motion and the strength of this force is proportional to the viscosity. A fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. Zero viscosity is observed only at very low temperatures in superfluids. Otherwise, the second law of thermodynamics requires all fluids to have positive viscosity;[2][3] such fluids are technically said to be viscous or viscid [4]. A fluid with a relatively high viscosity, such as pitch, may appear to be a solid. Dynamic and kinematic viscosity is common in fluid dynamics, which is ratio of the viscosity to the density of the fluid . The viscosity is? frequently called the dynamic viscosity or absolute viscosity . The purpose of present study is to compare the viscosity of different forms of matter.