hukum termodinamika(b.ing)
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Group 3 :Group 3 :
1.Ainia Rohmah2.Anggre Tiara O3.Dewi Puspita4.Hajar Panca S5.Millati Azka6.Nuraini7.Setyo Aji W.W8.Toni Wijayanto
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Isothermal
Isobaric
Isochoric
adiabatic
thermodynamics
definition
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First law of First law of thermodynamicsthermodynamicsFirst Law of thermodynamics states that :
Whenever heat Q is given to a system, a portion of heat is used to increase its internal energy in the amount of U, whereas the remaining leaves the system when the system performs a work W to its surroundings.
Mathematically, the first law of thermodynamics is formulated by :
Q = U + W
Q>0
Q<0
W>0 W<0
W positip jika sistem melakukan usaha
W negatip jika sistem dikenai usaha
Q positip Jika sistem menerima kalor
Q negatip jika sistem melepas kalor
Energi dalam U tidak terpengaruh oleh proses, yang dilihat adalah hanya pada keadaan awal dan keadaan akhir
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The first law of thermodynamics for The first law of thermodynamics for isothermal processisothermal process
At isothermal Process : T = 0, so U = 0
The work done by the isothermal process is :
,so
Q = U + W = 0 + W = W
Q =
1
2lnV
VnRTW
1
2lnV
VnRTW
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The first law of thermodynamics for The first law of thermodynamics for isobaricisobaricprocessprocess
At isobaric process the pressure is constant
DP = 0
Internal energy , so
)(2
5
2
52
3
12 VVPVPQ
VPVPWUQ
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The first law of thermodynamics The first law of thermodynamics for for
isochoric processisochoric process
At Isochoric process volume is constant, V = 0, so the work done W = PV = 0, its produce :
)(2
3
2
3
0
12 TTnRTnRUQ
UWUQ
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The first law of thermodynamics The first law of thermodynamics for adiabaticfor adiabatic
process processAdiabatic process is a process without any transfer of heat into or from the system (Q=0)and it applies :
)(2
3
)(2
3
0
21
12
TTnRW
TTnRUW
WU
WUQ
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and
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