A non-newtonian fluid is a type of fluid whose viscosity changes with the applied shear rate or stress, meaning it does not have a constant viscosity. Unlike Newtonian fluids, which maintain a consistent flow regardless of the forces acting on them, non-newtonian fluids exhibit unique behavior such as shear thinning, shear thickening, or even time-dependent viscosity. These characteristics make them fascinating and complex in their interactions with external forces.
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