Consider a process in which the pressure of a gas remains constant at 150kPa while its volume increases from 0.020m3 to 0.035m3.
(a) Sketch a pressure–volume graph of the process, labeling both axes with appropriate scales and units.
(b) Determine the numerical value (including sign) of the work done on the gas during the expansion.
(c) If the gas were returned to its original volume along the same horizontal path on the graph, what work would be done on the gas? Provide both magnitude and sign, and explain your reasoning.