A convergent nozzle with exit diameter of 1 in. has an air inlet flow of 68 F, 14.7 lbf/in 2 (stagnation conditions). The nozzle has an isentropic efficiency of 95% and the pressure drop is measured to 20 in. water column. Find the mass flow rate assuming compressible adiabatic flow. Repeat calculation for incompressible flow.