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Inertial force is characterized by fluid density (p). Kinematic viscosity, on the other hand, is a ratio of the viscous force to the inertial force. However, the most common expression is centipoise (cP), which is mainly used in ASTM standards. For cgs, dynamic viscosity is in a unit called ‘poise’, which is taken from the name of Jean Louis Marie Poiseuille. Its SI unit is in pascal-second (Pa.s) or N.m^-2.s. Chemists and physicists, on the other hand, normally use ‘n’ as a symbol. Fluid dynamicists, chemical engineers and mechanical engineers commonly consider the use of the Greek letter mu (µ) as the symbol to denote dynamic viscosity. In reality, they are two significantly different expressions.ĭynamic viscosity, which is also referred to as absolute viscosity, or just viscosity, is the quantitative expression of a fluid’s resistance to flow (shear). Many are confused between these two types of viscosity expression, and some even consider them to be one and the same. It can either be expressed as dynamic viscosity, or kinematic viscosity. There are two ways to report or measure a fluid’s viscosity. Viscosity can also be considered as a measure of the friction of fluids, as it also describes the internal resistance of the flow of fluid. On the other hand, honey is significantly ‘thick’, and is a fluid with a higher viscosity. Water is considered as ‘thin’, thus, the viscosity is lower. A great example of this, is the difference in the viscosities of water and honey. In common terms, viscosity is the thinness or thickness of the fluid.
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Viscosity expresses the fluid’s resistance against either tensional stress, or shear stress. The measure of that resistance is called viscosity. Every type of fluid possesses differing amounts of resistances against deformation.