Water with a density p2 = 1000 kg/m3 and mineral oil with a density p1 = 800 kg/m3, located in a closed tank, compress the air with excess pressure p0 (Fig.). The interface between mineral oil and water is located at a distance h1 = 0.3 m from the free surface. Indication of the U-shaped mercury manometer h = 0.4 m. The difference in heights of the free surfaces of liquids in the tank and the mercury manometer is h = 0.4 m. Determine the air pressure on the free surface p0.
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