Consider the piston–cylinder arrangement shown in the sketch below. The gas forces on each side of the piston, assuming there are no frictional forces at the piston–cylinder interface, balance the weight of the piston. Determine the absolute pressure of the air (in psia) and the mass of air in the cylinder (in lbm). The atmospheric pressure is 14.6 psia.

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Patm Air 90 F Piston mass = 24 lbm Piston area = 9 In² Local gravitational 8 In acceleration = 31 ft/s² K ➜