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A Newtonian fluid is a fluid whose viscosity remains constant regardless of the applied shear stress, meaning its flow behavior is predictable and linear. Definition and Characteristics A Newtonian fluid is defined by Newton’s law of viscosity, which states that the shear stress between adjacent layers of the fluid is directly proportional to the rate of shear strain (or velocity gradient) between them, with the constant of proportionality being the fluid’s viscosity. In simpler terms, a Newtoni