1. Consider air as an ideal gas undergoing an isentropic process from state 1 to state 2. Show that.
2. Consider a compressor compressing a gas from state 1 to state 2. Show that compressor work can be given as:
W = h2 - h1.
3. Consider a gas expanding from state 1 to state 2 in a turbine. Show that W = h1 - h2.