$${R_V = 1,20 \times 10^{-3}\, \mathrm{m^3} \sqrt{\frac{(2)(4120\, \mathrm{Pa})}{(3)(791\, \mathrm{kg/m^3}}} \\ = \underline{\underline{2,24 \times 10^{-3}\, \mathrm{m^3/s}}}}$$