NEWTON’s law of viscosity,\({\rm{\TAU \;\alpha }}\frac{{{\rm{du}}}}{{{\rm{dy}}}}\)\({\rm{\tau }} = {\rm{\mu }} \times \frac{{{\rm{du}}}}{{{\rm{dy}}}}{\rm{\;}}\)μ = Dynamic viscosity in Pa.secAccording to Power-law model\({\rm{\tau }} = {\rm{m}} \times {\left( {\frac{{{\rm{du}}}}{{{\rm{dy}}}}} \right)^{\rm{n}}}\)where,m = flow behaviour indexn = flow characteristic indexExplanation:Type of BehaviorDescriptionExamplesNewtonianViscosity is independent of stressWater, mercury, glycerine, air, ENGINEERING oilsDilatantViscosity increases with increased stressQuicksand, Cornstarch, CONCENTRATED SUGAR solutionPseudoplasticViscosity decreases with increased stressMilk, bloodRheopecticViscosity increases with stress over timeGypsumThixotropicViscosity decreases with stress over timepaints