A tower packed with $(1)/(2)$ in Raschig Ring is to be built to perform a gas absorption

process. The temperature is $20$oC and pressure is $1$ atm. The gas$-$to$-$liquid mass

flux ratio is $1.$ The gas and liquid densities are $0\mathrm{.}0012$ g$/$cm$3$ and $1\mathrm{.}00$ g$/$cm$3,$

respectively. Kinematic viscosity of liquid is $0\mathrm{.}90$ centistokes. Calculate the

superficial velocity of gas mixture as m$/$s$.$