maximum work during reversible process?????? I have seen maximum work is achievable when the process is carried out reversibly. Is it correct? For example, if you look at the following problems, 1) Ten litres of an ideal gas at a pressure of 10 atm expands isothermally against a constant pressure of 1 atm until its total volume becomes 100 litres.The amount of heat absorbed in the expansion is The answer is -90 L-atm (I have used the formula w = -p(ext)*(v2-v1)) 2) Ten litres of an ideal gas at a pressure of 10 atm expands isothermally under reversible conditions until the final volume becomes 100 litres.The amount of heat absorbed in the expansion is The answer is -23.03 L-atm (Here the formula used is w = -2.303*p(internal)*log v2/v1) In the first problem, the process is irreversible and the process in second problem is reversible. Here the work done in case of irreversible process is greater than that in reversible process. (Just consider the absolute values and not the negative signs) Could you please explain this? Am I wrong anywhere?