This process is then compared to a reversible process, with the same initial state, but with a (possibly) different final state. The theoretical specific entropy and enthalpy after this ideal, isentropic process are given by s 2 , r e v and h 2 , r e v , respectively. When the actual process is compared to this theoretical reversible process and W ˙ ˙ l o s t is evaluated, the proper effective temperature is given by T e f f = h 2 − − h 2 , r e v s 2 − − s 2 , r e v In general, T e f f lies somewhere in between the final temperature in the actual process T 2 and the final temperature in the theoretical reversible process T 2 , r e v .