Path Independence of Entropy Change

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SUMMARY

The discussion focuses on proving the path independence of entropy change in thermodynamics. Key equations presented include the differential form of entropy change, dS = dQ/T, and its relation to heat transfer and volume changes. The user derives several expressions for entropy change, including dS = nC_d[ln(T)] + nR[ln(V)] and dS = (nC dT + PdV)/T, indicating a strong grasp of the underlying principles. The conversation emphasizes the importance of understanding the relationships between temperature, volume, and entropy in thermodynamic processes.

PREREQUISITES
  • Understanding of thermodynamic principles, particularly entropy.
  • Familiarity with the first and second laws of thermodynamics.
  • Knowledge of differential calculus as applied to physical equations.
  • Basic concepts of heat transfer and state functions.
NEXT STEPS
  • Study the derivation of the Clausius inequality and its implications for entropy.
  • Explore the relationship between entropy and the second law of thermodynamics.
  • Learn about Maxwell's relations and their application in thermodynamic equations.
  • Investigate the implications of path independence in various thermodynamic cycles.
USEFUL FOR

Students and professionals in physics and engineering, particularly those specializing in thermodynamics, heat transfer, and energy systems.

sigmaro
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Is there any way to prove that entropy change is independent from the path?


dS=dQ/T
dQ=dE+PdV
d(PV)=PdV+VdP
dS=nCd[ln(T)]+nR[ln(T)]-VdP/T
i go this far, but it is not very different from dS=nCd[ln(T)]+PdV/T
 
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i think i got it
dS=dQ/T
dS=(nCdT+PdV)/T
PV=nRT
dS=nCd[ln(T)]+nRTdV/TV
dS=nCd[ln(T)]+nRd[ln(V)]
can somebody check?
 

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