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Overview

Dynamic viscosity ($\mu$) is a measure of a fluid's resistance to shear or tensile stress. It relates the shear stress in a fluid to the rate of strain (velocity gradient).

Key Formulas

Newton's Law of Viscosity

$\tau = \mu \frac{du}{dy}$

Shear stress is proportional to velocity gradient.

Kinematic Viscosity

$\nu = \frac{\mu}{\rho}$

Dynamic viscosity divided by density.

Variables

Symbol	Description	Unit
$\mu$	Dynamic viscosity	Pa·s
$\tau$	Shear stress	Pa
$\nu$	Kinematic viscosity	m²/s
$\rho$	Density	kg/m³

Reference Data

Viscosity Converter

References

• Original Source