Sabtu, 11 Juli 2009

Termodinamika

TERMODINAMIKA

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




2.2 Corollaries of the First Law

  1. Work done in any adiabatic ($ Q=0$ ) process is a function of state. We can write the first law, setting the heat transfer term equal to zero, as
    $\displaystyle \Delta U = \cancelto{0}{Q} - W.$ (2..3)

    Since $ \Delta U$ depends only on the state change, now $ W$ can be found as a function of the state change.

    Figure 2.3: The change in energy between two states is not path dependent.
    Image fig3AdiabaticWorkPathIndependence_web

  2. For a cyclic process heat and work transfers are numerically equal

    Figure 2.4: Since energy is a function of state only, any process that returns a system to its original state leaves its energy unchanged.
    Image fig3CyclicPathWEqualsQ_web

    $\displaystyle U_{\textrm{final}} = U_{\textrm{initial}}$

    therefore
    $\displaystyle \Delta U = 0$

    and
    $\displaystyle Q = W \qquad \textrm{or}\qquad \oint \delta Q=\oint \delta W$


Ucapan Terima Kasih:

Kepada Para Dosen di MIT dan Dosen Fisika FPMIPA Universitas Pendidikan Indonesia

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