Entropy per unit mass question (ds)

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Discussion Overview

The discussion revolves around questions related to entropy changes in thermodynamic processes, specifically focusing on the implications of different values of entropy change (ds) and the nature of processes based on these values. The scope includes conceptual understanding and clarification of thermodynamic principles.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that if ds = 0, the process is reversible.
  • Another participant agrees that if ds < 0, it is possible, but questions the implications of such a scenario.
  • A participant proposes that if ds1 < ds2, then ds1 is "more" reversible than ds2, though this terminology is questioned by others.
  • There is a request for clarification on what is meant by "more" reversible, with one participant asserting that it refers to having less irreversibilities.

Areas of Agreement / Disagreement

Participants generally agree on the implications of ds = 0 and ds < 0, but there is disagreement regarding the terminology of "more" reversible and what it signifies in the context of thermodynamic processes.

Contextual Notes

There are unresolved questions about the interpretation of negative entropy changes and the definition of reversibility in thermodynamic processes.

ksle82
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I'm attempting to answer these thermodynamic quesions about entropy. It's been years since my last thermo course so knowledge is cloudy. If I'm incorrect or missiong relevant answers, please help.

a. If ds = 0, what can you say about the process?
b. If ds < 0, what can you say about the process?
c. If ds1 < ds2, what can you conclude about these processes?

A. process is reversible
B. ds<0 <----is this possible?
C. ds1 is "more" reversible than ds2
 
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a. yes
b. yes, its possible
c. yes, that's true.
 
If it's possible for the answer B, then what can I say about the process? I don't recall learning anything about ds<0.
 
What do you mean by "more" reversible? I don't understand. A process can either be reversible or irreversible. What do you mean when you say more reversible?
 
He means it has less irreversibilities.
 

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