![]() The first law of thermodynamics for isobaric processAt isobaric process the pressure is constantDP = 0 3Internal energy ∆U = P∆V, so 2 3Q = ∆U + W = P∆V + P∆V 2 5 5Q = P∆V = P (V2 − V1 ) 2 2 The first law of thermodynamics for isothermal process At isothermal Process : ∆T = 0, so ∆U = 0 The work done by the isothermal process is : V2 so W = nRT ln V1 Q = ∆U + W = 0 + W = W V2 Q = W = nRT ln V1 Mathematically, the first law of thermodynamics is formulated by : Q>0 Q = ∆U + W W positip jika sistem melakukan usaha W negatip jika sistem dikenai usaha Q positip Jika sistem menerima kalorW>0 W<0 Q negatip jika sistem melepas kalor Energi dalam ∆U tidak terpengaruh oleh proses, yang dilihat adalah hanya pada keadaan awal dan keadaan akhir Q<0 Laws ofThermodynamics 1 Disusun Oleh : Ichwan Aryono, S.Pd.įirst law of thermodynamics First 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.
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