So work done by a gas is positive and work done on the gas is negative correct? So I was looking at a question and it showed a chart and asked what happens to the net work when you go from A to B. B has a greater volume than A and they are both at the same pressure so you can either calculate the area under the line or use W=PV. Since the volume is decreasing doesnt that mean that the gas is having work done to it, so the energy would be negative? To add this is coming from EK 1001 chemistry and the question #336 and it uses A and F, but same deal. The explanation is : "Volume is decreased on the gas, so work is done on the gas."