Newton's law of viscosity and Newtonian fluids

Newton’s law of viscosity is given by

Ƭ = µ du/dy

Where,

Ƭ = shear stress.

µ = absolute or dynamic viscosity.

du/dy = velocity gradient.

Newtonian fluids: Fluids which follow this law are known as Newtonian fluids.

Example of Newtonian fluids are Air, water etc.

But non Newtonian fluids are tar, paste, blood, glycerin etc.