One cubic foot (1 ft3) of air is contained in a piston - cylinder arrangement. The axis of the cylinder is oriented in the same direction as gravity, with a 100 lbm, 1 ft-dia piston on top of the air. The air surrounding the piston-cylinder is at 14.7 psi. What is the gage pressure of the air in the cylinder? What is the absolute pressure of the air in the cylinder?