Entropi: Perbedaan antara revisi

[[FileBerkas:Ice water.jpg|thumbjmpl|Es yang meleleh pada suhu ruangan merupakan [[Entropi#Es melebur|contoh]] dari naiknya entropi,<ref group="note">In complex systems of molecules, such as at the [[critical point (thermodynamics)|critical point]] of water or when salt is added to an ice-water mixture, entropy can either increase or decrease depending on system parameters, such as temperature and pressure. For example, if the spontaneous crystallization of a supercooled liquid takes place under adiabatic conditions the entropy of the resulting crystal will be greater than that of the supercooled liquid (Denbigh, K. (1982). ''The Principles of Chemical Equilibrium'', 4th Ed.). In general, however, when ice melts the entropy of the adjoined hot and cold bodies increases. Some further tutorials: [http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA3/MAIN/ENTROPY/PAGE1.HTM Ice-melting] (example by ''[[Journal of Chemical Education]]''—subscription required); [httphttps://web.archive.org/web/20090222060701/http://www.bartleby.com/64/C004/024.html Ice-melting and Entropy Change] (example by ''The American Heritage Book of English Usage''—archive.org copy); [httphttps://web.archive.org/web/20091015043726/http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/ThermLaw2/Entropy/InterptEntropy.html Ice-melting and Entropy Change] (discussion by [[Western Washington University]]—archive.org copy)</ref> dijelaskan pada tahun 1862 oleh [[Rudolf Clausius]] sebagai kenaikan [[disgregasi]] molekul air pada es.<ref>Clausius, Rudolf (1862). Communicated to the Naturforschende Gesellschaft of Zurich, January 27, 1862; published in the Vierteljahrschrift of this Society, vol. vii. p. 48; in Poggendorff’s Annalen, May 1862, vol. cxvi. p. 73; in the Philosophical Magazine, S. 4. vol. xxiv. pp. 81, 201; and in the Journal des Mathematiques of Paris, S. 2. vol. vii. p. 209.

'''Entropi''' adalah salah satu [[Daftar besaran termodinamika|besaran termodinamika]] yang mengukur energi dalam sistem per satuan temperatur yang tak dapat digunakan untuk melakukan [[usaha (termodinamika)|usaha]]. Mungkin manifestasi yang paling umum dari entropi adalah (mengikuti hukum termodinamika), entropi dari sebuah [[sistem termodinamika|sistem]] tertutup selalu naik dan pada kondisi transfer [[panas]], energi panas berpindah dari komponen yang bersuhu lebih tinggi ke komponen yang bersuhu lebih rendah. Pada suatu sistem yang panasnya terisolasi, entropi hanya berjalan satu arah (bukan proses reversibel/bolak-balik). Entropi suatu sistem perlu diukur untuk menentukan bahwa energi tidak dapat dipakai untuk melakukan [[usaha termodinamika|usaha]] pada [[proses termodinamika|proses-proses termodinamika]]. Proses-proses ini hanya bisa dilakukan oleh energi yang sudah diubah bentuknya, dan ketika energi diubah menjadi kerja/usaha, maka secara teoritisteoretis mempunyai efisiensi maksimum tertentu. Selama kerja/usaha tersebut, entropi akan terkumpul pada sistem, yang lalu [[disipasi|terdisipasi]] dalam bentuk [[panas]] buangan.

Pada termodinamika klasik, konsep entropi didefinisikan pada [[hukum kedua termodinamika]], yang menyatakan bahwa entropi dari [[sistem tertutup (termodinamika)#sistem terisolasi|sistem yang terisolasi]] selalu bertambah atau tetap konstan. Maka, entropi juga dapat menjadi ukuran kecenderungan suatu proses, apakah proses tersebut cenderung akan "terentropikan" atau akan berlangsung ke arah tertentu. Entropi juga menunjukkan bahwa [[energi panas]] selalu mengalir secara spontan dari daerah yang suhunya lebih tinggi ke daerah yang suhunya lebih rendah.

== Catatan ==

== Referensi ==

== Bacaan lebih lanjut ==

* {{Cite book|last=[[Arieh Ben-Naim|Ben-Naim]]|first=Arieh|year=2007|title=Entropy Demystified|publisher=World Scientific|isbn=981-270-055-2}}

* {{Cite book|last=Dugdale|first=J. S.|year=1996|title=Entropy and its Physical Meaning|edition=2nd|publisher=Taylor and Francis (UK); CRC (US)|isbn=0-7484-0569-0}}

* {{Cite book|last=Fermi|first=Enrico|authorlink=Enrico Fermi|year=1937|title=Thermodynamics|publisher=Prentice Hall|isbn=0-486-60361-X}}

* {{Cite book|last=Gyftopoulos|first=E.P.|coauthor=G.P. Beretta|year=1991, 2005, 2010|title=Thermodynamics. Foundations and Applications|publisher=Dover|isbn=0-486-43932-1}}

* {{Cite book|last=Kroemer|first=Herbert|coauthor=Charles Kittel|year=1980|title=Thermal Physics|url=https://archive.org/details/thermalphysics0000kitt|edition=2nd|publisher=W. H. Freeman Company|isbn=0-7167-1088-9}}

* {{Cite book|last=Penrose|first=Roger|authorlink=Roger Penrose|year=2005|title=The Road to Reality: A Complete Guide to the Laws of the Universe|url=https://archive.org/details/roadtorealitycom00penr_0|isbn=0-679-45443-8|publisher=A. A. Knopf|location=New York}}

* {{Cite book|last=Reif|first=F.|year=1965|title=Fundamentals of statistical and thermal physics|url=https://archive.org/details/fundamentalsofst00fred|publisher=McGraw-Hill|isbn=0-07-051800-9}}

* {{Cite book|authors=Goldstein, Martin; Inge, F|title=The Refrigerator and the Universe|url=https://archive.org/details/refrigeratoruniv0000gold|publisher=Harvard University Press|year=1993|isbn=0-674-75325-9}}

* {{Cite book|author=vonBaeyer; Hans Christian|title=[[Maxwell's Demon]]: Why Warmth Disperses and Time Passes|publisher=Random House|year=1998|isbn=0-679-43342-2}}

* [[b:Entropy for beginners|Entropy for beginners]]

* Biel, R. and Mu-Jeong Kho (2009) "[http://webu2.upmf-grenoble.fr/regulation/wp/document/RR_serieID_2009-1.pdf The Issue of Energy within a Dialectical Approach to the Regulationist Problematique] {{Webarchive|url=https://web.archive.org/web/20120508034316/http://webu2.upmf-grenoble.fr/regulation/wp/document/RR_serieID_2009-1.pdf |date=2012-05-08 }}," Recherches & Régulation Working Papers, RR Série ID 2009-1, Association Recherche & Régulation: 1–21.

== Pranala luar ==

* [http://www.spiraxsarco.com/resources/steam-engineering-tutorials/steam-engineering-principles-and-heat-transfer/entropy-a-basic-understanding.asp Entropy – A Basic Understanding] A primer for entropy from a chemical perspective

* [http://www.7stones.com/Homepage/Publisher/entropy.html Interactive Shockwave Animation on Entropy]

* [[Max Jammer]] (1973). [http://etext.lib.virginia.edu/cgi-local/DHI/dhi.cgi?id=dv2-12 ''Dictionary of the History of Ideas'': Entropy] {{Webarchive|url=https://web.archive.org/web/20130127094314/http://etext.lib.virginia.edu/cgi-local/DHI/dhi.cgi?id=dv2-12 |date=2013-01-27 }}

* Frank L. Lambert; [http://entropysite.oxy.edu/ entropysite.oxy.edu] {{Webarchive|url=https://web.archive.org/web/20130114223933/http://entropysite.oxy.edu/ |date=2013-01-14 }} – links to articles including simple introductions to entropy [http://www.entropysite.com/students_approach.html for chemistry students] {{Webarchive|url=https://web.archive.org/web/20060702234316/http://www.entropysite.com/students_approach.html |date=2006-07-02 }} and [http://www.entropysimple.com/ for general readers] {{Webarchive|url=https://web.archive.org/web/20121122041416/http://www.entropysimple.com/ |date=2012-11-22 }}.

* [http://www.lightandmatter.com/html_books/0sn/ch05/ch05.html Thermodynamics] {{Webarchive|url=https://web.archive.org/web/20170228144433/http://www.lightandmatter.com/html_books/0sn/ch05/ch05.html |date=2017-02-28 }} – a chapter from an online textbook

* [http://www.physnet.org/modules/pdf_modules/m160.pdf ''Entropy''] on [http://www.physnet.org Project PHYSNET]

* [http://www.mdpi.com/journal/entropy/ ''Entropy''] – an Open Access journal

* [http://en.wikibooks.org/wiki/An_Intuitive_Guide_to_the_Concept_of_Entropy_Arising_in_Various_Sectors_of_Science ''An Intuitive Guide to the Concept of Entropy Arising in Various Sectors of Science''] – a wikibook on the interpretation of the concept of entropy.

[[CategoryKategori:KonsepEntropi| fisika]]

[[CategoryKategori:Entropi|Konsep fisika]]

[[CategoryKategori:Termodinamika]]