3. The water in a tank is pressurized by air, and the pressure is measured by a multi-fluid manometer as shown. Determine the gauge pressure of air in the tank (in kPa) if h1 = 0.2 m, h2 = 0.3 m, and h3 = 0.4 m. Take the densities of water, oil and mercury to be 1000 kg/m, 850 kg/m, and 13 600 kg/m, respectively. Air Water -- Oil Mercury

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The water in a tank is pressurized by air, and the pressure is measured by a multi-fluid manometer as shown. Determine the gauge pressure of air in the tank (in kPa) if h1= 0.2m,h2=0.3m, and h3=0.4m. Take the densities of water, oil and mercury to be 1000 kg/m3,850kg/m3, and 13600kg/m3, respectively