- Isothermal Expansion
- Adiabatic or Isentropic Expansion
- Isothermal Compression
- Adiabatic or Isentropic Compression
The cycle is ordinarily plotted on two axes in two different ways: Pressure and Volume, in which case the cycle is a curvy quadrilateral and descending to the right, or Temperature and Entropy, in which case the cycle is a nice rectangle that emphasizes the isothermal and adiabatic (isentropic) aspects of the steps.
Images of the Carnot Cycle from Google search.
Tip of the hat to:
Stuart Kauffman / Investigations
Also please see the previous posts: