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12.3 Second Law of Thermodynamics: Entropy - Physics | OpenStax

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[BL][OL][AL] Review heat and absolute temperature. Recall earlier discussions on engine efficiency. Assess students' understanding of efficiency. Recall from the chapter introduction that it is not even theoretically possible for engines to be 100 percent efficient. This phenomenon is explained by the second law of thermodynamics, which relies on a concept known as entropy. Entropy is a measure of the disorder of a system. Entropy also describes how much energy is not available to do work. The more disordered a system and higher the entropy, the less of a system's energy is available to do work. The meaning of entropy is difficult to grasp, as it may seem like an abstract concept. However, we see examples of entropy in our everyday lives. For instance, if a car tire is punctured, air disperses in all directions. When water in a dish is set on a counter, it eventually evaporates, the individual molecules spreading out in the surrounding air. When a hot object is placed in the room, it q

12.3 Second Law of Thermodynamics: Entropy - Physics | OpenStax Skip to Content Go to accessibility page Keyboard shortcuts menu Physics 12.3 Second Law of Thermodynamics: Entropy Physics 12.3 Second Law of Thermodynamics: Entropy Contents Highlights Print Close 12.3 Second Law of Thermodynamics: Entropy By the end of this section, you will be able to do the following: Describe entropy Describe the second law of thermodynamics Solve problems involving the second law of thermodynamics Teacher Support The learning objectives in this section will help your students master the following standards:

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