Piston. The initial gas pressure is Po=1.78x10^5 Pa and the initial temperature is To=320 K. The gas goes in a thermodynamic cycle: (I) isobarically compressed to half its original volume (I1) adiabatically expands back to its original volume: 1 heated isochorically to its original pressure.
Calculate:
1. The values of the state variables of the gas at pivot points of this cycle.
2. The change of the internal energy of the gas at the adiabatic expansion.
3. The total work done by the gas in this cycle.
Solution: Initially, let's obtain the thermal properties of the working media of this cycle, nitrogen gas. One will use these properties in the later solution. Nitrogen is a gas of the rigid diatomic molecules, thus its molar isochoric heat capacity is equal to.