A mercury manometer (ρ = 13,600 kg/m3) is connected to an air duct to measure the pressure...

A mercury manometer (ρ = 13,600 kg/m3) is connected to an air duct to measure the pressure inside. The difference in the manometer levels is 15 mm, and the atmospheric pressure is 100kPa. (a) Judging from Fig. P2-56, determine if the pressure in the duct is above or below the atmospheric pressure.(b) Determine the absolute pressure in the duct.