Lecture26

Lecture26 - Chapter 20 Entropy and the Second Law of...

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Chapter 20 Entropy and the Second Law of Thermodynamics 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010
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20.2. Entropy Isothermal process and Free expansion: The samples 1 and 2 include the same gas , in the same amounts , at the same temperature , and having the same internal energy . Difference between samples 1 and 2 : The gas molecules in the sample 1 has less space for chaotic movement compared to sample 2 . Gas in the sample 1 has more order and less chaos than gas in the sample 2 . Entropy is a measure of the order and chaos in the systems. A system with a less order and more chaos has a higher entropy . 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 1 2 2 1 Isothermal process Free expansion
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Adiabatic process: The gas sample is insulated and pressed. The gas volume is decreased, but the gas temperature is increased. The decreased volume decreases also chaos, but increase of temperature increases chaos. The entropy remains constant. Conclusion: In adiabatic pressing of the gas the gas temperature is increased, but entropy does not change because gas volume is decreased. 3
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This note was uploaded on 01/26/2011 for the course PHYS 2101 taught by Professor Grouptest during the Spring '07 term at LSU.

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Lecture26 - Chapter 20 Entropy and the Second Law of...

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