An air bubble of radius 1mm moves up with uniform velocity of 0.109 ms^-1 in a liquid column of density 14.7 x 10³ kg/ m³, then coefficient of viscosity will be $\left(\mathrm{g}=10{\mathrm{ms}}^{-2}\right)$ ${\mathrm{\rho }}_{\text{air }}=1.3\mathrm{kg}/{\mathrm{m}}^3$