Question: A cylindrical tank containing oil with a density of 800 kg/m3. The depth is 3.0 meters. Above the oil is air with some pressure. A U-tube is connected to the air-filled space in the tank with one leg and the other flows into the open air. The tube contains mercury with a density of 13600 kg/m3. Calculate both absolute and relative pressure on the bottom of the tank if the meniscus (mercury surface) of the leg opening in the open air is a / 100 mm above the other b / 100 mm below the other. The atmospheric pressure is 990 hPa.