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Non-newtonian fluid. A fluid that departs from the classic linear newtonian relation between stress and shear rate. In a strict sense, a fluid is any state of matter that is not a solid, and a solid is a state of matter that has a unique stress-free state.
Each unique material has its own behavior when subjected to flow, deformation or stress. . When studying the flow of matter, one of the most important properties is viscosity (i.e. the resistance of a fluid to flow). Fluids are characterized as Newtonian or non-Newtonian based on their viscosity behavior. Newtonian Fluids Newtonian fluids are those whose viscosity is independent of shear rate. The viscosity of these materials will remain a constant no matter how fast they are forced to flow through a pipe or channel.