TAILIEUCHUNG - Lecture Companion site to accompany thermodynamics: An engineering approach (7/e): Chapter 7.1 - Yunus Çengel, Michael A. Boles

Chapter - Entropy: A measure of disorder. The objectives of this chapter are to: Apply the second law to processes; define a new property called entropy as it applies to commonly encountered engineering processes; discuss the Clausius inequality, which forms the basis for the definition of entropy;. | Chapter 7 Entropy: A Measure of Disorder Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 7th edition by Yunus A. Çengel and Michael A. Boles Entropy and the Clausius Inequality The second law of thermodynamics leads to the definition of a new property called entropy, a quantitative measure of microscopic disorder for a system. Entropy is a measure of energy that is no longer available to perform useful work within the current environment. For more information and animations illustrating this topic visit the Animation Library developed by Professor S. Bhattacharjee, San Diego State University, at this link. To obtain the working definition of entropy and, thus, the second law, let's derive the Clausius inequality. Consider a heat reservoir giving up heat to a reversible heat engine, which in turn gives up heat to a piston-cylinder device as shown below. We apply the first law .

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