Steam containing 2 percent air is condensed at atmospheric pressure inside 25-mm tubes in a water-cooled condenser. The vertical tubes are 3 m long; the coefficient and temperature of the cooling water are 2.500 W/m²·°C and 30°C, respectively. Calculate the condensation rate expected if no air was present, and use this value to estimate the Reynolds number of the vapor at the tube inlet. If 96 percent of the steam were condensed, what would be the vapor Reynolds number at the tube outlet? Calculate the equilibrium condensation temperature of the exit vapor, and show why the actual temperature at the vapor-liquid interface in the condenser would be lower than this value.