The barometer gives incorrect readings due to the presence of air above the mercury column. At pressure p1 = 755 mmHg. Art. the barometer shows 748 mm Hg. Art., and at a pressure p2 = 740 mm Hg. Art. shows 736 mmHg. Art. What will be the barometer reading at pressure p3 = 760 mmHg? Art.? The air temperature is assumed to be constant. Neglect the change in mercury level in the cup.

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