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- Thread starter corona7w
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In summary, entropy can be thought of as a measure of how reversable the system is. For cycles, the entropy change within the system should be 0, since the process ends up in the same state as the beginning. So does this mean that the entropy change for the system is 0 for both reversible and irreversible cycles?Yes.

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Irreversable cycles lose something to the surroundings, so you can take the ideal cycle and apply real world components to it. Those components will never be 100% efficient meaning you cannot travel back along the line (reverse the process) and get that energy back from the surroundings.

Entropy has to be one of the most mind bending concepts to grasp at first (sometimes I still get confised)

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Yes. The change in entropy of a system is the integral of dQ/T on a reversible path between two states. If there is no change in the state of the system, there can be no change in entropy. The difference between reversible and irreversible processes is in the entropy change of the surroundings.corona7w said:

AM

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Of course. But it will necessarily end up in a different state.lanedance said:

AM

Entropy is a thermodynamic property that measures the degree of disorder or randomness in a system. In reversible cycles, entropy remains constant as the cycle is reversible, while in irreversible cycles, entropy increases due to the presence of irreversibilities.

In reversible cycles, the change in entropy is directly proportional to the heat transfer, as the process is reversible and the heat transfer is a reversible process. In irreversible cycles, the change in entropy is greater than the heat transfer, as some of the heat is lost to the surroundings due to irreversibilities.

No, entropy can only remain constant or increase in a reversible cycle. This is because reversible processes have no irreversibilities and therefore no increase in entropy.

Entropy generation refers to the increase in entropy due to irreversibilities in a process. Entropy increase, on the other hand, refers to the overall increase in entropy including both reversible and irreversible processes.

In a reversible cycle, the efficiency is equal to the ratio of the heat transfer to the maximum possible heat transfer. This maximum possible heat transfer is given by the change in entropy of the system. Therefore, entropy plays a crucial role in determining the efficiency of a reversible cycle.

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