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# Hukum termodinamika(b.ing)

## by Ainia D'forezth on Apr 28, 2013

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## Hukum termodinamika(b.ing)Presentation Transcript

• Group 3 :Group 3 :1.Ainia Rohmah2.Anggre Tiara O3.Dewi Puspita4.Hajar Panca S5.Millati Azka6.Nuraini7.Setyo Aji W.W8.Toni Wijayanto
• First law of thermodynamicsFirst law of thermodynamicsFirst Law of thermodynamics states that :Whenever heat Q is given to a system, a portion of heat is used toincrease its internal energy in the amount of ∆U, whereas theremaining leaves the system when the system performs a work W toits surroundings.Mathematically, the first law of thermodynamics is formulated by :Q = ∆U + WQ>0Q<0W>0 W<0W positip jika sistem melakukan usahaW negatip jika sistem dikenai usahaQ positip Jika sistem menerima kalorQ negatip jika sistem melepas kalorEnergi dalam ∆U tidak terpengaruh oleh proses,yang dilihat adalah hanya pada keadaan awal dankeadaan akhir
• The first law of thermodynamics for isothermalThe first law of thermodynamics for isothermalprocessprocessAt isothermal Process : ∆T = 0, so ∆U = 0The work done by the isothermal process is :,soQ = ∆U + W = 0 + W = WQ =12lnVVnRTW =12lnVVnRTW =
• The first law of thermodynamics for isobaricThe first law of thermodynamics for isobaricprocessprocessVPU ∆=∆23At isobaric process the pressure is constantDP = 0Internal energy , so)(25252312 VVPVPQVPVPWUQ−=∆=∆+∆=+∆=
• The first law of thermodynamics forThe first law of thermodynamics forisochoric processisochoric processAt Isochoric process volume is constant, ∆V = 0,so the work done W = P∆V = 0, its produce :)(2323012 TTnRTnRUQUWUQ−=∆=∆=+∆=+∆=
• The first law of thermodynamics for adiabaticThe first law of thermodynamics for adiabaticprocessprocessAdiabatic process is a process without any transferof heat into or from the system (Q=0)and it applies:)(23)(2302112TTnRWTTnRUWWUWUQ−=−−=∆=−+∆=+∆=
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