Cold / high-P<0.000012Typical (atm)0.000012-0.000017Warm / low-P0.000017-0.000035Hot / very low-P0.000035+
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Kinematic viscosity: 0.000015 m²/s
At 20.0 °C and 101,325 Pa, air has a dynamic viscosity of 1.8134e-5 Pa·s and a density of 1.2041 kg/m³.
Kinematic viscosity is 0.99x the standard-atmosphere value at 20 °C (1.516 × 10⁻⁵ m²/s).
At typical indoor or outdoor temperatures near sea level, kinematic viscosity stays close to 1.5 × 10⁻⁵ m²/s, the value most engineering tables use as a standard reference.
Kinematic viscosity appears in the Reynolds number (Re = V*L/nu), which determines whether flow around an object is laminar or turbulent.
Next stepUse this value in the Reynolds number formula (Re = V × L ÷ nu) to check whether airflow over your surface is laminar (Re < 5 × 10⁵) or turbulent.