a closed tank contains two straified non misicble fluid layers and compressed air. the fluid of the tank is saline water (relative density 1.036) with a total depth of 3.5m. the top fluid layer is oil (relative density of 08.2) with a depth of 0.6 m. the upper part of the tank is filled with compressed air. a u-tube manometer that s connected to the tank 1.00m above the bottom shows 500mm of mercury (mmHg) pressure difference. what is the height of the pure water column (x) if manometer reading is 51kPa gauge pressure. the relative density of pure water in the u-tube is 1.00