A term which describes the flow characteristics of a fluid. A Newtonian fluid is one where the shear rate is proportional to the shear stress. This proportionality is the fluid viscosity. Water and most hydrocarbon liquids (crude oils, gasoline, diesel, etc.) are examples of Newtonian fluids.
term used to describe the viscous behavior of a fluid - where the viscosity is independent of both time and shear stress.
A term used to describe the rheological characteristics of a liquid that has an absolute viscosity, i.e., water, that does not change with temperature fluctuations or shear rate.