Problem. Find Work done by each path. My Solution. a-b, c-d >> W=P(delta)V a-c, b-d >> W=0 My Question. What is the work done by the gas (path a-d)? My Thoughts. There is a change in both pressure and volume. However, the equation to find the work in this situation is "W=P(delta)V". There is no (delta)P.