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• Reversible process


  The overall entropy of the system does not increase during the process, and the initial and final temperatures for the process are the same
• Entropy


  Relates to the transfer of energy, and it can only increase, unlike energy which can only decrease
• Lowest degree of entropy

  • a diamond crystal
  • a block of paraffin
• State property


  A property that does not depend on the history of the system and gives a complete description of the system
• Heat engine


  Transfers heat from a higher temperature reservoir to a lower temperature reservoir through work performed on the system, and 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, and no heat transfer occurs between the system and its surroundings