Question 1

What is kinematic viscosity?

Accepted Answer

Kinematic viscosity is dynamic viscosity divided by density, representing a fluid's resistive flow under gravity.

Question 2

What is a centistoke?

Accepted Answer

A centistoke (cSt) equals 1 mm²/s. It is commonly used to express kinematic viscosity of oils and fuels.

Question 3

How does kinematic viscosity relate to dynamic viscosity?

Accepted Answer

Kinematic viscosity (ν) = dynamic viscosity (μ) ÷ density (ρ). For water at 20 °C: μ ≈ 1 mPa·s and ρ ≈ 998 kg/m³, so ν ≈ 1.004 mm²/s (1.004 cSt).

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