Dynamic viscosity
Dynamic viscosity (η) is defined on the basis of its unit of force as the proportionality factor between the shear stress (τ) and the velocity gradiant (∂ vx / ∂ y). For this purpose it is dependent only on temperature and on pressure.
Dynamic viscosity (η) is derived from the NEWTONian formulation of shear stress (see NEWTONian liquid):
