The pressure difference between two horizontal cylindrical vessels filled with water and gas (air) is measured using a differential pressure gauge filled with alcohol (p2) and mercury (p3). Knowing the air pressure above the free surface of the water in one of the vessels, determine the gas pressure p if pair = 2.5•104 N/m2; p1 = 1000 kg/m3; p2 = 800 kg/m3; p3 = 13600 N/m3; h1 = 200 mm; h2 = 250 mm; h = 0.5 m; g = 10 m/s2 (Fig. ).
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