ME200 - Lecture 26

ME200 - Lecture 26 - 10/29/2010 Tds Relationships

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10/29/2010 1 T ds Relationships Entropy Change for Incompressible Substances ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 26 October 29 th , 2010 Lecture Outline Last Lecture: Second Law of Thermodynamics Clausius Inequality Entrop Entropy Increase of Entropy Principle This Lecture: Entropy of Pure Substances T s and h s Diagrams ME 200 2 T ds Relationships Entropy Change for Incompressible Substances
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10/29/2010 2 What is Entropy? •F r om the molecular viewpoint, entropy associated with disorder within the system o r a given macroscopic thermodynamic equilibrium state, at the molecular level thousands of microscopic states possible • Boltzmann Relation   p k S ln k constant Boltzmann What does that mean?. .. K J x / 10 3806 . 1 23 p = thermodynamic probability ME 200 3 Entropy is proportional to the number of possible microscopic configurations of the individual atoms and molecules of the system (microstates) which could give rise to the observed macroscopic state (macrostate) of the system. •L i ke other thermodynamic properties ( v , u and h ), entropy ( s ) is listed in property tables • Properties listed with respect to some reference state Entropy: Pure Substances • Usually, only property differences will be important;
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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ME200 - Lecture 26 - 10/29/2010 Tds Relationships

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