Kinematic Viscosity

Definition of Kinematic Viscosity:

• Kinematic viscosity is the ratio of dynamic viscosity to the density of the fluid.
• $\nu = \frac{\eta}{\rho}$

Where:

• ν = kinematic viscosity (units: m²/s or centistokes, cSt)
• η = dynamic viscosity (e.g., poise, centipoise)
• ρ = density of the fluid (e.g., g/cm³)

Why is it important?

• It relates viscosity to the physical mass of the fluid.
• It’s especially important in flow meters and in hydrodynamics, where fluid movement is also affected by density.

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