Newtonian fluids are the ones that have constant viscosity, which is independent of shear rate. The fluids are mainly classified into two – Newtonian fluids and Non-Newtonian fluids. The unit of viscosity is newton-second per square meter, and the SI unit of viscosity is pascal-second. The resulting solution is usually expressed in centipoise, which is equal to one millipascal second. Viscosity= Shear stress/Shear strain rate Kinematic viscosity is the dynamic viscosity divided by the density at that exact temperature at which the dynamic viscosity is measured. There are majorly two types of viscosity.ĭynamic viscosity is the resistance to the movement of one layer of fluid over the other. Shear rate: The shear rate can be defined as the measure of change in speed at which intermediate layers move concerning one another.Shear stress: Shear stress is the force per unit area required to move one layer of fluid about another.Important Termsīefore understanding viscosity, one must understand two important terms. The SI unit is hence called pascal-second. The unit of viscosity is newton-second per metre square. These liquids are thicker and stickier hence making them viscous liquids. Viscosity can be understood better by studying liquids like oils, honey, syrup, etc. However, if we had to describe viscosity in terms of physics, it can be defined as the resistance shown by a fluid to permanent deformation. Viscosity can be simply explained in non-physical terms as the sticky and thick characteristics of a liquid.
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