Determine the air flow rate of a gear helical pneumatic motor K 0.25, if the initial absolute pressure of compressed air is p1 = 0.5 MN/m2, the final absolute pressure at exhaust p2 = 0.12 MN/m2, the initial and final air temperatures t1 = t2 = 20 °C, rotor rotation speed ng = 3000 min-1, relative value of the harmful space m0 = 0.15, leakage coefficient hу = 0.9.