2300_les13 - V. The Second Law of Thermodynamics A....

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1 lesson 13 V. The Second Law of Thermodynamics A. Introduction 1. The first law: energy is conserved 2. The second law: certain processes do occur and certain processes don’t a. example of a mechanical process (assume adiabatic, piston- cylinder device) b. example of a thermal process If the pins are removed, our experience tells us which way the piston will move. P Vacuum Gas at pressure P T H T L Insulating barrier High T reservoir Low T reservoir If the barrier is removed, our experience tells us which way heat will flow. lesson 13 V. The Second Law of Thermodynamics c. example of a less obvious process It was easy to predict what would happen in the previous two examples, based on our experience. Consider a less obvious example: Magic Vortex Tube Compressed air Hot air Cold air How can we use our experience to know whether this process is possible? Is there a way to generalize our experience with simple processes so that we can make decisions about more complex processes?
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2 lesson 13 V. The Second Law of Thermodynamics B. Heat Engines 1. Definition of heat engine: a cyclic device that converts heat to work a. First Law:
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This note was uploaded on 09/04/2009 for the course CHEM 2300 taught by Professor Thermo during the Summer '08 term at University of Utah.

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2300_les13 - V. The Second Law of Thermodynamics A....

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