Kinematic Viscosity of Air Calculator
Compute ν (m²/s) from temperature, pressure, and RH
How to Use This Calculator
1
Enter Temperature
Provide air temperature in °C.
2
Enter Pressure
Provide station pressure in hPa.
3
Enter Relative Humidity
Provide RH as a percentage (0–100%).
4
Calculate
Review μ, ρ, and ν results.
Formula
μ = μ₀ · (T₀ + C)/(T + C) · (T/T₀)^1.5
ρ = p_d·100/(R_d·T) + e·100/(R_v·T)
ν = μ / ρ
Constants: μ₀=1.716×10⁻⁵ Pa·s at 0°C, C=111 K, R_d=287.058, R_v=461.495
About Kinematic Viscosity
Kinematic viscosity describes how easily air flows and diffuses, influencing Reynolds number and boundary layers in aerodynamics and HVAC design.
Frequently Asked Questions
How sensitive is ν to temperature?
Viscosity increases with temperature while density decreases, both raising ν.
Do I need to include humidity?
Humidity slightly reduces density; including RH gives a more accurate ν estimate.