For isotropic Newtonian fluids, these can be reduced to two independent parameters.

Even for a Newtonian fluid, the viscosity usually depends on its composition and temperature.

Normal plasma behaves like a Newtonian fluid at rates of shear.

Newtonian fluids can be characterized by a single coefficient of viscosity for a specific temperature.

Water and air are examples of (practically) Newtonian fluids.

By contrast Newtonian fluids have flat featureless surfaces when still.

In the former case, the viscosity corresponds to that for a Newtonian fluid.

For this reason, these equations are usually written for Newtonian fluids.

The most commonly used types of generalized Newtonian fluids are:

Most research at this point has been done on what are known as Newtonian fluids - water, oil and alcohol.