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열역학을 붙잡고 씨름하다보니 여러가지 의문점들이 생기네요 - -);

Chapter 5로 거슬러 올라가서,

모두들 아시다시피
Constant T, P 일때 System이 할 수있는 최대 Non P-V work의 값이 -ΔG라고 한다.

라고 한다 라고 언급되어있습니다만, 그러면 Constant T, P 가 아닌 경우의
깁스프리에너지의 의미는 무엇일까요 ?

단지 쓸데없는 값일 뿐일까요 ?

질문하는 제 입장에서도 어리석인 질문인듯합니다만,  우문현답을 기대합니다 - -);;;

  • ?
    유준 2007.05.02 01:47 (*.223.154.152)
    저도 설명을 들은 것이자만 Gibbs Free Energy는 어떤 반응이 자발적으로 일어날지 일어나지 않을지에 대한 의문을 해결해 준다고 합니다. 좀더 정확히 말하면, 그 반응이 자발적으로 일어나는 것에 대해서는 정확한 정보를 주지 못해도, 적어도 그 반응이 자발적으로 잃어날 수 없다는 것은 정확하게 알려 준다고 하더군요... 그리고 좀더 덧붙이자면, 일정한 압력에서의 공식이라 일상생활과 많이 유사한 조건이라고 합니다.
  • ?
    김동훈 2007.05.02 15:16 (*.223.155.204)
    Constant T, P 일때 System이 할 수있는 최대 Non P-V work의 값이 -ΔG라고 합니다.

    이 말은, 깁스 프리 에너지의 경우 T, P를 independent한 variable로 가진다는 말과 같습니다.

    즉, 깁스프리에너지는 T와 P가 내 마음대로 control이 가능할 때 의미를 가집니다.

    S, V를 independent variable로 가지는 내부에너지나, T, V를 independent variable로 가지는 헬름홀츠 프리에너지에 비해서 깁스에너지를 많이 사용하는 이유도 바로 이것입니다. 실제 생활에서 T, P를 control하는 것이 가장 쉽기 때문이죠.

    실제로도, 대부분 반응의 자발성을 판별할 때, Gibbs free energy criterion를 사용한다고 합니다.
  • ?
    강민구 2007.05.02 15:58 (*.223.155.164)
    아아아. 수업시간에 교수님께서 언급하셨던 기억이 나네요.

    이런 의미였군요.
  • ?
    황홍익 2007.05.02 20:50 (*.223.125.225)
    자발성의 판단기준으로 엔트로피를 설정하면 System과 Surrouding 모두를 고려해 주어야 하기 때문에 불편합니다. 하지만 자유에너지를 사용한다면 System만 고려해 주어도 반응이 자발적으로 일어나는지 아닌지 판단할 수 있습니다. 자유에너지 식을 유도하는 과정에서 확인할 수 있듯이 우주의 엔트로피 변화량의 부호는 System의 자유에너지 변화량의 부호와 항상 반대이죠. 그래서 우리는 System의 자유에너지 변화량이 음이면 우주의 엔트로피 변화를 양이 된다고 생각하여 반응이 자발적으로 일어난다고 예상할 수 있습니다.
    하지만 전에 제가 적었던 글 중에서 '열역학을 공부하려면~~~해야한다' 글을 참고 해주세요. 여기서 P, T가 변할 경우에는 자유에너지의 변화량 보다는 우주의 엔트로피 변화를 관찰하여 반응이 자발적으로 일어나는 방향을 예측하는 것이 정확하다고 합니다. 즉, 자유에너지의 변화가 음 일때 반응이 자발적이라는 것은 특정한 경우에만 적용된다는 것이죠. 열역학 수업을 듣는 친구들(?)과 같이 토론해보고 싶어서 글을 올렸는데 아무도 관심이 없네요;;
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    me adc4.2

List of Articles
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368 에너지 등분배법칙에 대하여. 4 강민구 2007.04.18 25627
367 다섯번째 과제물 file Byeong-Joo Lee 2007.04.18 22277
366 Chapter 5. Problem 2번에서 질문입니다. 2 최일용 2007.04.20 22391
365 Pure element에서 G의 의미. 7 김동훈 2007.04.23 22985
364 비정질 -> 결정질, Thermodynamics & Kinetics 3 황홍익 2007.04.24 23709
363 여섯번째 과제물 file Byeong-Joo Lee 2007.04.25 22094
362 공부와 열역학 - 열역학을 공부하려면 쉬고 해야 한다? 2 황홍익 2007.04.26 26395
361 질문 4 유준 2007.04.30 21911
360 오늘 제출했던 열역학 숙제문제중에서. 3 강민구 2007.05.01 22073
» 깁스프리에너지에 관하여. 5 강민구 2007.05.01 28165
358 열역학 제 3법칙 6 김동훈 2007.05.02 39241
357 가장 안정한 상태에서의 엔탈피를 0으로 정하지 않습니까? 8 유창순 2007.05.03 25194
356 공부하다가 모르는거 있어서.. 4 김동훈 2007.05.05 22669
355 Chapter 7 & 6번째 숙제 6 유준 2007.05.05 24199
354 7단원에서요- 5 김혜민 2007.05.07 22416
353 이번 숙제 7.9 6 유준 2007.05.08 22340
352 p.196 맨 위에 줄에 있는 식. 1 최일용 2007.05.23 22987
351 Problem Set#7 file Byeong-Joo Lee 2007.05.29 21651
350 2차 중간고사 4번문제 5 강민구 2007.05.29 23214
349 Phase Diagram file Byeong-Joo Lee 2007.05.30 20587
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