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RELASI MAXWELL
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• Potensial termodinamika memberikan info lengkap tentang
sistem termodinamik.
• Dari potensial termodinamika U,H, F, dan G diperoleh
diferensial eksak berikut
• = −
• = − = − −
• = + = − +
• = +
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Sifat derivatif
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V S S
P
V
T
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• , karena dU eksak, maka
• U =−
karena dH eksak, maka
),( V S U U
dV V
U dS
S
U dU
S V
S P P
H V
S
H T
;
V S S
P
V
T
S V
U
V S
U 22
=+
dP
P
H dS
S
H dH
S P
S V V
U P
S
U T
;
S S S
V
P
T
S P
H
P S
H 22
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• , karena dF eksak, maka
• = − −
• , karena dG eksak, maka
),( V S U U
dV V
F dT
T
F dF
T V
T P P
GV
T
GS
;
V T T
P
V
S
T V
F
V T
F 22
= − +
dP
P
GdT
T
GdG
T P
T V V
F P
T
F S
;
P T T
V
P
S
S P
H
P S
H 22
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Besaran yang terukur
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• ?
Relasi Maxwell
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Bermain dengan derivatif parsial
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Energi dalam besaran terukur
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Entalpi dalam besaran terukur
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Energi bebas dalam besaran terukur
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G dalam besaran Terukur
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Tugas
(1) a. Tunjukkan Relasi berikut berlaku
b.Berikan penjelasan artinya
2. Tunjukkan
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Contoh: Perubahan ke bentuk terukur
N T N V V
S
V T
F
T
P
,
2
,
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? ?
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Metode Jacobian
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