Problem 2 A sealed piston-cylinder assembly initially contains a gas at temperature T, pressure P , and volume V. The piston has a mass m, a cross-sectional area A, and its top surface is subjected to atmospheric pressure. a The gas undergoes a heating process and reaches new equilibrium state characterized by a temperature T, pressure P2, and volume V2. piston mass: m cross-sectional area: A Palm heating T, V, P Palm T, V, P State 1 State 2 By writing a force balance for the piston at each state, demonstrate that the gas pressure remained constant during the heating process.