please answer all parts

ideal 1. (10 points) The following diagram shows the P-V plots of an adiabatic, reversible and isothermal, reversible expansion of an gas. Use it to answer the following questions. (1 pt) Which one is the reversible isothermal expansion process? a. Pressure b. (1 pt) Which one is the reversible adiabatic expansion process? P2 P V Volume Ver C. (1 pt) Which one is the cooling at constant volume process? d. (3 pt) What is the relation of P, V1, P2, V2, how about the relation of P1, V1, P2, V2:? e. (4 pts) Provide an expression (in terms of P, V, T,...) of the area isolated by the three curves