solution of this question.a rigid tank contains 0.4m^3 of air at 400 kpa and 30 degree celsius is connected by a valve to a piston cylinder device with zero clearence . the mass of piston is such that a pressure of 200kpa is required to raise the piston. the valve is now opened slightly and air is allowed to flow into cylinderuntill the pressure in the tank drops to 200kpa . during this process heat is exchanged with surrounding such that the entire air remains at 30 degree celsius at all times.determine the heat transfer for this process.