1. Gas at 15C and an absolute pressure of 250 kPa flows through the 200-mm-diameter duct at VA = 20 m/s. Determine the rise in pressure, = PB-PA, when the gas passes through the transition and into the 400-mm-diameter duct. The temperature of the gas remains constant. Since the temperature will remain constant and there will be a slight increase of pressure, we can reasonably take the density of the gas is constant throughout of the process starting from point A to point B. Take, R=286.9 J/kg.K and K= o C 273