A mass of 1.8 kg of air at 120 kPa and 34°C is contained in a gas-tight, frictionless piston–cylinder device. The air is now compressed to a final pressure of 600 kPa. During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the work input during this process. The gas constant of air is R = 0.287 kJ/kg. K [Tcr = 132.5 K, Pcr = 3.77 MPa]