Hii have a few questions about entropy:why does the definition

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The discussion centers on the concept of entropy, specifically addressing the reversible nature of heat exchange in thermodynamic systems, as expressed by the equation dS=dQ_rev/T. It is established that processes are only reversible when the change in entropy (ΔS) equals zero. The user highlights that isothermal, isobaric, and isochoric processes involving ideal gases are generally irreversible, reinforcing the importance of understanding these thermodynamic principles in relation to entropy.

PREREQUISITES
  • Understanding of the Second Law of Thermodynamics
  • Familiarity with thermodynamic processes (isothermal, isobaric, isochoric)
  • Knowledge of entropy and its mathematical representation
  • Basic principles of heat exchange in thermodynamic systems
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  • Study the implications of the Second Law of Thermodynamics on entropy
  • Explore the characteristics of reversible and irreversible processes in thermodynamics
  • Learn about the mathematical derivation of dS=dQ_rev/T
  • Investigate the behavior of ideal gases under different thermodynamic conditions
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Students of thermodynamics, physicists, and engineers interested in the principles of entropy and heat exchange in thermodynamic systems.

Gavroy
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hi

i have a few questions about entropy:

why does the definition of entropy stress the fact that the heat exchange by the system is reversible(dS=dQ_rev/T)?

am i right, that processes are only reversible iff ΔS=0 and therefore e.g. isothermic, isobaric and isochoric processes even of ideal gases are irreversible in general?
 
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