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Viscosity measurement3/21/2024 ![]() Extensional viscosity is the viscosity coefficient when applied stress is extensional stress valid for non-Newtonian fluids.Shear viscosity is the viscosity coefficient when applied stress is a shear stress, valid for non-Newtonian fluids.Bulk viscosity is the same as volume viscosity.Volume viscosity is the viscosity coefficient that determines the dynamics of compressible Newtonian fluid.Kinematic viscosity is the dynamic viscosity divided by the density for Newtonian fluid.Dynamic viscosity is the viscosity coefficient that determines the dynamics of incompressible Newtonian fluid.They are introduced in the main books on hydrodynamics and rheology. There are several different viscosity coefficients depending on the nature of applied stress and nature of the fluid. ![]() When looking at a value for viscosity, the number that one most often sees is the coefficient of viscosity. A viscous glue was made from mistletoe berries and used for lime-twigs to catch birds. ![]() The word "viscosity" derives from the Latin word " viscum" for mistletoe.
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