![]() ![]() Hence having an idea about the viscosity coefficient is crucial for deciding the purpose of the oil. The oils with a lower viscous coefficient can be used for car engines. To select the most suitable oil for machinery, we must know about the viscosity coefficient. The oil used for greasing the heavy machinery parts must have a higher viscous coefficient.Here are some of the most noticeable applications of viscosity. There are endless applications of viscosity in daily life. Extensional Viscosity- Extensional viscosity is the viscosity coefficient when the applied stress is extensional stress.Relative Viscosity- It refers to the ratio of the viscosity of a solution to the viscosity of the solvent used.It is the shear stress divided by the shear rate. Steady Shear Viscosity- It refers to the relationship between viscosity and shear rate.It is the measurement of the viscosity of the fluid in motion. Kinematic Viscosity- It refers to the ratio of dynamic viscosity to the density of the fluid.Dynamic Viscosity- The measurement of the fluid’s internal resistance to flow when force is applied.The CGS unit of kinematic viscosity is the stokes. The S.I unit of kinematic viscosity is metre square per second, written as m²/s. The S.I unit of dynamic viscosity is newton-second per square metre(N.s/m²), which is also frequently expressed in the forms of pascal-second, Kg/ms, and Poiseuille. Viscosity = shear stress/ shear strain rate Units Viscosity is represented with the help of the expression, A fluid with zero viscosity is often called an ideal fluid. A fluid with zero viscosity is observed at a very low temperature. ![]() These states include the temperature of the fluid, pressure, and rate of deformation. Generally, the viscosity of the liquid is dependent on some states of the liquid. Whenever a viscous liquid is flown through a tube, it seems that it flows more quickly near the axis of the tube as compared to the walls of the tube. Viscosity gives a quantity to the internal frictional force between layers of fluid that is in motion. The viscosity of fluids is the measure of their resistance to deformation at a certain rate. One such example of viscosity is oil being thicker than water. However, in physics, the definition is much more proper as it goes, “viscosity of a fluid is the measure of its resistance to deformation at a given rate”. In general, whenever we say that a liquid is viscous, we mean that the liquid is very thick. Viscosity is described as the state of being too thick, sticky, or semi-fluid. The word viscosity comes from the Latin word “viscum”, which refers to the gum derived from the mistletoe berries. ![]()
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