This equation above can sometimes be simplified. If both the pressure and the specific heat capacity remain constant, then the changes in enthalpy and entropy can be written in terms of the temperatures, and T e f f = T 2 − − T 2 , r e v ln ⁡ ⁡ T 2 − − ln ⁡ ⁡ T 2 , r e v = T 2 − − T 2 , r e v ln ⁡ ⁡ T 2 T 2 , r e v However, it is important to note that this version of the theorem doesn't relate the exact values which the original theorem does. Specifically, in comparing the actual process to a reversible one, the modified version allows the final state to be different between the two. This is in contrast to the original version, wherein reversible process is constructed to match so that the final states are the same.