(19-27) Sketch a PV diagram of the following process: 2.0 L of ideal gas at atmospheric pressure are

(19-27) Sketch a PV diagram of the following process: 2.0 L of ideal gas at atmospheric pressure are cooled at constant pressure to a volume of 1.0 L, and then expanded isothermally back to 2.0 L, whereupon the pressure is increased at constant volume until the original pressure is reached.