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6 Cards in this Set
- Front
- Back
Second law two statements |
Kelvin plank statement: impossible to convert heat completely into work. Clausius statement: Cannot transfer heat from a cold body to hot body without expending work. |
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Equivalence of kelvin plank and clausius statement |
1. Assume clausius and combine refrigerator and heat engine. 2. Assume kelvin plank and combine refrigerator and heat engine. Remember refrigerator takes heat from cold to hot |
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Area of T-S diagram gives |
Quantity of heat |
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Clausius theorem + proof |
In any reversible cycle the net change in entropy is zero. Assume zero entropy change for Carnot cycle. Divide cycle into small Carnot cycles. Sum each Carnot cycle |
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Prove entropy is a state function. |
Draw cycle reversible. Net Change in entropy of cycle zero. Change direction in return path. Hence prove that entropy is path independent or it's a state function. |
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Entropy of an isolated system |
Always increases as the entropy of the universe is the same as entropy of the system. |