Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 k to 7 bar, 600 k. the air can be modeled as an ideal gas and kinetic and potential energy effects are negligible. determine the amount of entropy produced, in kj/k per kg of air, for the compression. what is the minimum theoretical work input, in kj per kg of air, for an adiabatic compression from the given initial state to a final pressure of 7 bar? note that work is positive into the compressor.