Copyright statementcontents.kocw.net/KOCW/document/2013/korea/chayjunegone1/... · 2016. 9. 9. ·...
Transcript of Copyright statementcontents.kocw.net/KOCW/document/2013/korea/chayjunegone1/... · 2016. 9. 9. ·...
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Copyright statement
• The images and the pictures in this lecture are provided by the CDs accompanied by the books
1. University Physics, Bauer and Westfall,
McGraw-Hill, 2011.
2. Principles of Physics, Halliday, Resnick,
and Walker, Wiley, 8th and 9th Ed.
• The rest is made by me.
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Translational kinetic energy
Mean free path
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분자의 속력분포
Maxwell 속력분포법칙
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Average speed rms speed The most probable speed
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등적비열
RCV 23
V
VT
Q
nC
1
단원자 기체
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등압비열
p
pT
Q
nC
1
RCC Vp
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Adiabatic expansion
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Degrees of freedom and molar heat
에너지 등분배 법칙 (energy equipartition theorem): 분자당 자유도 당 몰 당 의 에너지를 갖는다.
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Ch. 20 The 2nd law of thermodynamics
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Irreversible processes and entropy
다음과 같은 과정은 결코 자발적으로 일어나지 않는다.
닫힌 계에서 비가역과정이 일어날 때 엔트로피 S는 감소하지 않는다.
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The 2nd law of thermodynamics
1) 계의 다른 변화 없이, 열이 온도가 낮은 곳에서 높은 곳으
로 열이 이동할 수는 없다. (완벽한 냉장고는 없다.)
2) 계의 다른 변화 없이, 열을 몽땅 일로 바꾸는 것은 불가능
하다. (완벽한 엔진은 없다.)
3) 고립계의 열역학적 과정에서 엔트로피는 감소할 수 없다.
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entropy
자유팽창의 경우 – 등온과정을 고려