Div2Lec05 - Lecture 5: Review 2nd Law of Thermodynamics...

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Lecture 5: Review 2nd Law of Thermodynamics General formulation of the 2 nd Law: » “All processes are irreversible!” What does irreversible mean? » System and surroundings cannot be returned to the initial state without energy input that was not generated uring the initial process during the initial process. Examples: . Q Body @ T T 1 > T > T o T o time time T o 5.1 T 1 > T o
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Continue Review 2nd Law of Thermodynamics Continue Examples of irreversible processes: p o CV CV CV p 1 > p o p 1 > p > p o p o time time m m time time 5.2 m
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Continue Review 2nd Law of Thermodynamics Notes: » In each case, auxiliary work is required to return the system to its original state. This work was not enerated during the initial process: generated during the initial process: Causes change in the surroundings » Systems have a tendency towards equilibrium: The systems went from a state of high energy to a state of low energy, resulting in more disorder » Whenever equilibrium between system and urroundings does not exists then there is potential to 5.3 surroundings does not exists, then there is potential to do work. For uncontrolled processes, this work is lost.
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Continue Review 2nd Law of Thermodynamics Reversible Processes: » A reversible process is a “hypothetical” process where system and surroundings can be restored to the initial state without any changes in the surroundings.
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Div2Lec05 - Lecture 5: Review 2nd Law of Thermodynamics...

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