5.3 Combined First and Second Law Expressions
The first law, written in a form that is always true:
For reversible processes only, work or heat may be rewritten asSubstitution leads to other forms of the first law true for reversible processes only:(If the substance has other work modes, e.g., stress, strain,where is a pressure-like quantity, and is a volume-like quantity.)Substituting for both and in terms of state variables,
The above is always true because it is a relation between properties and is now independent of process.In terms of specific quantities:
The combined first and second law expressions are often more usefully written in terms of the enthalpy, or specific enthalpy, ,
Or, since ,
In terms of enthalpy (rather than specific enthalpy) the relation is
Disusun Ulang Oleh:
Arip Nurahman
Pendidikan Fisika, FPMIPA. Universitas Pendidikan Indonesia
&
Follower Open Course Ware at MIT-Harvard University. Cambridge. USA.
Materi kuliah termodinamika ini disusun dari hasil perkuliahan di departemen fisika FPMIPA Universitas Pendidikan Indonesia dengan Dosen:
1. Bpk. Drs. Saeful Karim, M.Si.
2. Bpk. Insan Arif Hidayat, S.Pd., M.Si.
Dan dengan sumber bahan bacaan lebih lanjut dari :
Massachusetts Institute of Technology, Thermodynamics
Professor Z. S. Spakovszk, Ph.D.
Office: 31-265
Phone: 617-253-2196
Email: zolti@mit.edu
Aero-Astro Web: http://mit.edu/aeroastro/people/spakovszky
Gas Turbine Laboratory: home
Ucapan Terima Kasih:Kepada Para Dosen di MIT dan Dosen Fisika FPMIPA Universitas Pendidikan Indonesia
Semoga Bermanfaat
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