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Assalamu’alaikum
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Kelompok 2 :
1. Ibnu hafiz (133310227)
2. Arie prasetyo. (1333100!")3. #iski nan$a (13331003%)
&. 'oses pramana. (1333101"%)
!. oie pranata (13331010!)
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Isotherm
al
Isobaric
Isochori
c
adiabati
c
Termodinamika
defnisi
Reversible &
Irreversible
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First law ofFirst law of
thermodynamicsthermodynamicsFirst Law of thermodynamics states
that : Whenever heat Q is given to a system, a portion ofheat
is used to increase its internal energy in theamount of U, whereas
the remaining leaves thesystem when the system performs a work W to
itssurroundings.
Mathematically, the rst law of thermodynamics isformulated !y
:
Q " U # W
Q$%
Q&%
W$% W&%
W positip 'ika sistem melakukanusaha
W negatip 'ika sistem dikenai usaha
Q positip (ika sistem menerima kalor
Q negatip 'ika sistem melepas kalor
)nergi dalam U tidak terpengaruholeh proses, yang dilihat adalah
hanyapada keadaan awal dan keadaan akhir
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*ukum + termodinamika untukproses isothermal
*a$a proses isothermal: +, - 0 sehina +/ - 0
,he ork $one by the isothermal proess is :
- + / 4 - 0 4 - 4
4 - n#, ln 52651 sehina
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he rst law of thermodynamics forhe rst law of thermodynamics
for
iso!ariciso!aric
processprocess
V P U ∆=∆23
-t iso!aric process the pressure isconstant
/ " %+nternal energy , so
)(2
5
2
5
2
3
12 V V P V P Q
V P V P W U Q
−=∆=
∆+∆=+∆=
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he rst law of thermodynamicshe rst law of thermodynamics
forfor
isochoric processisochoric process
-t +sochoric process volume is
constant, 0 " %, so the work done W " /
0 " %, its produce :
)(2
3
2
3
0
12 T T nRT nRU Q
U W U Q
−=∆=∆=
+∆=+∆=
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he rst law of thermodynamicshe rst law of thermodynamics
for adia!aticfor adia!atic
processprocess -dia!atic process is a process
withoutany transfer of heat into or from thesystem 1Q"%2and it
applies :
)(2
3
)(2
3
0
21
12
T T nRW
T T nRU W
W U
W U Q
−=
−−=∆=−
+∆=
+∆=
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and
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