5_60_lecture8_9

5_60_lecture8_9 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #8-9 page 1 The Second Law First Law showed the equivalence of work and heat Δ U = q + w , dU = 0 for cyclic process = − Suggests engine can run in a cycle and convert heat into useful work. Second Law Puts restrictions on useful conversion of q to w Follows from observation of a directionality to natural or spontaneous processes Provides a set of principles for - determining the direction of spontaneous change - determining equilibrium state of system Heat reservoir Definition: A very large system of uniform T , which does not change regardless of the amount of heat added or withdrawn. Also called heat bath. Real systems can come close to this idealization. Different statements of the Second Law Kelvin: It is impossible for any system to operate in a cycle that takes heat from a hot reservoir and converts it to work in the surroundings without at the same time transferring some heat to a colder reservoir.
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This note was uploaded on 07/31/2011 for the course CHM 170 taught by Professor Lemtayo during the Spring '11 term at MIT.

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5_60_lecture8_9 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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