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• Reversible process


  • All heat input into the system is converted into work during the process
  • The overall entropy of the system does not increase during the process
  • The initial and final temperatures for the process are the same
• Entropy


  • Does not obey a conservation law
  • Relates to the transfer of energy
  • Can only increase
• State property


  • Gives a complete description of the system
  • Does not depend on the history of the system
• Heat engine


  • Transfers heat from a higher temperature reservoir to a lower temperature reservoir through work performed on the system
  • Uses input heat to perform work and rejects excess heat to a lower temperature reservoir
• Heat engines generally operate near one hundred percent efficiency
• An ideal engine has all system processes that are reversible