Carnot Cycle: Reversibility Under Constant External Pressure

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SUMMARY

The discussion centers on the Carnot cycle involving an ideal, monatomic gas undergoing four distinct steps: adiabatic expansion, isothermal expansion, adiabatic compression, and isothermal compression. The inquiry specifically addresses the implications of performing the first step, adiabatic expansion, against a constant external pressure. It concludes that the work done during this isobaric expansion would differ from the traditional adiabatic process, affecting the cycle's efficiency and endpoint.

PREREQUISITES
  • Understanding of the Carnot cycle and its four stages
  • Knowledge of thermodynamic principles, particularly adiabatic and isothermal processes
  • Familiarity with the concept of reversibility in thermodynamic cycles
  • Basic grasp of work calculations in thermodynamics
NEXT STEPS
  • Research the impact of constant external pressure on adiabatic processes
  • Study the efficiency differences between isothermal and adiabatic expansions
  • Explore the implications of reversibility in thermodynamic cycles
  • Learn about work calculations in isobaric versus adiabatic conditions
USEFUL FOR

This discussion is beneficial for students and professionals in thermodynamics, particularly those studying heat engines, as well as engineers and physicists interested in the efficiency of thermodynamic cycles.

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An ideal, monatomic gas is going through a 4 step Carnot cycle. Step 1 is an adiabatic expansion. Step 2 is an isothermal expansion. Step 3 is an adiabatic compression. Step 4 is an isothermal compression. The whole cycle is reversible. My question is how would the cycle change if step 1 is done against constant external pressure. Would the work be different?
 
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What would be the endpoint of that isobaric expansion? ehild
 
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