Idealized thermodynamic cycle consisting of four reversible processes (any substance):

- Reversible isothermal expansion (1-2, TH=constant)
- Reversible adiabatic expansion (2-3, Q=0, TH?TL)
- Reversible isothermal compression (3-4, TL=constant)
- Reversible adiabatic compression (4-1, Q=0, TL?TH)

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