Carnot Cycle: Reversibility Under Constant External Pressure

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In a Carnot cycle involving an ideal, monatomic gas, the process typically consists of adiabatic and isothermal steps. If step 1, the adiabatic expansion, occurs against constant external pressure, the nature of work done by the gas changes, potentially affecting the efficiency of the cycle. The endpoint of this isobaric expansion would be determined by the external pressure and the gas's properties. The overall work done in the cycle would differ compared to a standard adiabatic expansion. Understanding these modifications is crucial for analyzing the cycle's efficiency and performance.
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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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