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
Isothermal
Isobaric
Isochoric
adiabatic
thermodynamics
definition
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
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
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
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
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
and