1. The problem statement, all variables and given/known data If I have a diagram P-V how can I turn it into a T-S diagram? (Temperature-Entropy) 2. Relevant equations 3. The attempt at a solution I know that Q=TdS <=> dS = Q/T If a process is isothermic I'll just draw a line. If the process is adiabatic I'll draw a vertical line (constant S). For any other process I don't know what to do... Any help would be highly appreciated! If you have a book that explains this it would be perfect!