Q1: The water in a tank is pressurized by air, and the pressure is measured by a multi-fluid manometer, as shown in the figure. Determine the gauge pressure of air in the tank if h = 0.2 m, hz = 0.3 m, and h3 = 0.46 m. Specific gravities: oil - 0.85 and mercury - 13.6.
Oil
Air
Water
Mercury