No change in entropy of the system+surroundings in reversible process.Really?

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SUMMARY

The discussion centers on the conditions under which the total entropy change of a system and its surroundings remains zero during a reversible process. Participants clarify that while isothermal conditions are often associated with reversible processes, adiabatic processes can also be reversible, even though temperature is not constant. The key takeaway is that the total change in entropy, represented by the equation ΔS_total = ΔS_in + ΔS_out = 0, holds true for both reversible isothermal and adiabatic processes.

PREREQUISITES
  • Understanding of the Second Law of Thermodynamics
  • Familiarity with concepts of entropy and reversible processes
  • Knowledge of isothermal and adiabatic processes
  • Basic mathematical skills for thermodynamic equations
NEXT STEPS
  • Study the principles of the Second Law of Thermodynamics in detail
  • Learn about the mathematical formulation of entropy changes in thermodynamic processes
  • Explore the characteristics of isothermal and adiabatic processes
  • Investigate real-world applications of reversible processes in thermodynamics
USEFUL FOR

This discussion is beneficial for students and professionals in thermodynamics, physicists, and engineers interested in understanding the nuances of entropy in reversible processes.

kntsy
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No change in entropy of the system+surroundings in "reversible" process.Really?

This is a challenge to the sentense from some basic text.
I think reversible is not enough.
It has to be ISOTHERMAL, right?
Lets me be sure that i am correct!
 
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kntsy said:
This is a challenge to the sentense from some basic text.
I think reversible is not enough.
It has to be ISOTHERMAL, right?
Lets me be sure that i am correct!
No. An adiabatic process (eg. expansion or compression) can be reversible. In such a case, the temperature is not constant.

AM
 


Andrew Mason said:
No. An adiabatic process (eg. expansion or compression) can be reversible. In such a case, the temperature is not constant.

AM

Thanks! But what about REVERSIBLE isobaric, isovolume,? The total system+environment change in entropy still can remain zero?
I discover an important fact:
\triangle S_{total}=\triangle S_{in} +\triangle S_{out}=0
iff
\int\frac{dq_{in}}{T}=\int\frac{dq_{out}}{T}
iff
reversible isothermal or adabiatic!
 
Last edited:

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