What is the calculated approximate mass of water flowing per second Q (m^3.s^-1), if the height of the capillary tube is 2m and measured l the length of our capillary tube to be 1.5m, and r the radius is 1.15m, the length is 1.5m where the flow rate is 1.6m/s using Poiseuille's law in the calculation Q = ÏghÏ€r^4/8lη.