Kinematic viscosity for gas

The kinematic viscosity (also called momentum diffusivity) is the ratio of the dynamic viscosity $\mu$ to the density $\rho$.

It is a convenient concept when analyzing the Reynolds number, which expresses the ratio of the inertial forces to the viscous forces.

Symbol
$\nu_{gas}$
Unit
m$^2$/s
Formulae
$- 1.1555 \cdot 10^{-14} T_{air}^{3} + 9.5728 \cdot 10^{-11} T_{air}^{2} + 7.604 \cdot 10^{-9} T_{air} + 3.4484 \cdot 10^{-6}$air @ 1 bar (Dumas&Trancossi2009)
$\frac{\eta_{gas}}{\rho_{gas}}$general formula for gases
Related
$\eta_{gas}$
$\rho_{gas}$
Gas density [kg/m$^3$]
Used in
$\eta_{gas}$
$\mathrm{Gr}_{encl}$
$\mathrm{Gr}_{L}$