The air pressure in a duct is measured by a mercury manometer. For a given mercury-level difference between the two columns, the absolute pressure in the duct is to be determinedProperties The density of mercury is given to be ρ = 13,600 kg/m3Analysis (a) The pressure in the duct is above atmospheric pressure since the fluid column on the duct side is at a lower level(b) The absolute pressure in the duct is determined from