In class (earlier this week) we contrasted the "irreversible" piston-cylinder expansion process to the "reversible" process. The result was that the system cooled more in the reversible process because it did the maximum amount of work it could do. Thus, we link the terms "reversible" with "maximum work". However, what if we analyzing systems where "work" isn't an important quantity (such as a nozzle). Consider a system where steam enters a well-insulated nozzle at 350C and 4 bar. If the nozzle exhausts to the atmosphere (i.e., 1 bar), what is the maximum possible velocity of the exiting steam? What would be the temperature of this steam on exit (if it achieves the maximum possible velocity)