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Water is an example of a Newtonian fluid. Non-Newtonian fluids include catsup, paint, liquid detergent, liquid polymers and a variety of other liquids.

In a Newtonian fluid, the relation between the shear stress and the strain rate is linear, the constant of proportionality being the coefficient of viscosity. In simple terms, the size of the drops is directly related to the thickness of the fluid, all else being equal.

In a non-Newtonian fluid, the relation between the shear stress and the strain rate is nonlinear, and can even be time-dependent. Therefore a constant coefficient of viscosity can not be defined. Multi-viscosity motor oil, which changes viscosity with temperature, is a common example. Newtonian fluids obey Newton's laws.but non Newtonian fluids does not obey Newton's laws.

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Newtonian fluids have a constant viscosity, meaning their flow behavior is consistent regardless of the applied force. Non-Newtonian fluids, on the other hand, have variable viscosity that changes with the applied stress or shear rate. This results in non-linear flow behavior, unlike the linear flow seen in Newtonian fluids.

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11mo ago
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Q: What is the difference between Newtonian and non-Newtonian fluid?
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