Physical Chemistry Chapter 3 Carnot's Principle A Carnot cycle: a reversible cycle that consists of two isothermal steps at different temperatures and two adiabatic ster iSotherm 2 diabat adiabat isotherm (b) Fig 3.46 Carnot’s Principle A Carnot cycle: a reversible cycle that consists of two isothermal steps at different temperatures and two adiabatic steps. isotherm isotherm 1 2 4 3 V P     (b) adiabat adiabat Fig. 3.4 1 2 4 3 V P     (a) TH TC Physical Chemistry Chapter 3