Can someone explain entropy in engineering terms, as in T-s diagrams, what does it measure, the change in entropy of the working fluid? I understand if heat enters through a boiler, the entropy of the fluid increases, not really sure why though. Also, when work is done by a pump on the fluid, there is no change in entropy, even though the pressure increases, and temperature as well. I don't understand this whatsoever. Macro/microstates statistics bla bla. None if it makes fucking sense, does anyone even understand this?