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6. A simple piston setup (outside, at sea level, on a normal day) starts with a gas chamber filled with air at atmospheric pressure and the valve closed so the chamber is sealed (A).The piston is pulled upwards which causes the chamber to increase to four times its initial volume (B). The valve is then opened, allowing air to flow in or out of the chamber (C).Finally, the valve is closed again and then the piston is lowered back to its original position(D). Determine the pressure in the chamber for each state, A, B, C, and D, and thus rank them from most pressure to least pressure

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