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Unformatted text preview: increases kinetic energy, which increases disorder Adding heat always changes entropy: S = Q T Entropy S is 0 for a reversible process. S > 0 for irreversible processes 2 nd Law can be stated: S Energy Conversion It is possible to convert all kinetic or potential energy of a system to heat energy (100% efficiency). 2 nd Law says it's not possible to do the reverse. Impossible because of the disorder (entropy) of the system. Entropy and Probability 3 rd Law Since , and it is impossible to have negative kinetic energy, it is implies that temperatures under T = 0K are not possible. 2 nd Law tells us that all heat engines must expel heat to a cold reservoir, to a cold reservoir with T = 0K is not possible It is impossible for the temperature of a system to reach absolute zero. KE = 3 2 N k B T...
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This note was uploaded on 12/07/2011 for the course PHYS 220 taught by Professor Chang during the Fall '09 term at Purdue UniversityWest Lafayette.
 Fall '09
 CHANG
 Work, Entropy, Heat

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