Air at 110 kPa and 50C flows upward through a 6-cm-diameter inclined duct at a rate of 45 L/s. The duct diameter is reduced to 4 cm through a reducer. AP across the reducer is measured by a water manometer. Ah between the two points on the pipe where the two arms of the manometer are attached is 0.20 m. Determine the Ah between the fluid levels of two arms of the manometer (a) with and (b) without consideration of air column height on AP. Air