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Baris 3: Secara klasik, kekekalan energi berbeda dengan [[kekekalan massa]]; Namun, [[relativitas khusus]] menunjukkan bahwa massa berhubungan dengan energi dan sebaliknya dengan ''E = mc<sup>2</sup>'', dan sains sekarang berpandangan bahwa massa-energi secara keseluruhan kekal. Secara teoritis, ini menyiratkan bahwa setiap objek bermassa dapat dengan sendirinya diubah menjadi energi murni, dan sebaliknya, meskipun diyakini hanya mungkin dalam kondisi fisik yang paling ekstrim, seperti yang mungkin ada di alam semesta [[Zaman penyatuan besar\|tidak lama setelah Big Bang]]. atau saat [[lubang hitam]] memancarkan [[radiasi Hawking]]. Konsekuensi dari hukum kekekalan energi adalah bahwa [[Gerakan abadi#Klasifikasi\|mesin gerak abadi jenis pertama]] tidak dapat ada, dengan kata lain, tidak ada sistem tanpa suplai energi eksternal yang dapat mengirimkan energi dalam jumlah tak terbatas ke sekelilingnya. Untuk sistem yang tidak memiliki [[simetri translasi waktu]], mungkin tidak mungkin untuk mendefinisikan ''kekekalan energi''. Contohnya termasuk [[ruang gerak melengkung]] dalam [[relativitas umum]]<ref name="Grossman 2012">{{cite web\|last1=Grossman\|first1=Lisa\|date=18 January 2012\|title=Death-defying time crystal could outlast the universe\|url=https://www.newscientist.com/article/mg21328484-000-death-defying-time-crystal-could-outlast-the-universe/\|website=newscientist.com\|publisher=New Scientist\|archiveurl=https://archive.istoday/20170202104619/https://www.newscientist.com/article/mg21328484-000-death-defying-time-crystal-could-outlast-the-universe/\|archivedate=2017-02-02\|url-status=dead}}</ref> atau [[kristal waktu]] dalam [[fisika benda terkondensasi]].<ref>{{Cite web\|date=2017-02-02\|title=Death-defying time crystal could outlast the universe {{!}} New Scientist\|url=~~http~~https://~~archive~~www.isnewscientist.com/article/mg21328484-000-death-defying-time-crystal-could-outlast-the-universe/~~2LeIF~~\|website=archive.is\|access-date=2020-09-07\|archive-date=2017-02-02\|archive-url=https://archive.today/20170202104619/https://www.newscientist.com/article/mg21328484-000-death-defying-time-crystal-could-outlast-the-universe/\|dead-url=nounfit}}</ref><ref name="Powell 2013">{{cite journal\|last1=Powell\|first1=Devin\|year=2013\|title=Can matter cycle through shapes eternally?\|url=http://www.nature.com/news/can-matter-cycle-through-shapes-eternally-1.13657\|journal=Nature\|doi=10.1038/nature.2013.13657\|issn=1476-4687\|archiveurl=https://archive.istoday/20170203080014/http://www.nature.com/news/can-matter-cycle-through-shapes-eternally-1.13657\|archivedate=2017-02-03\|ref=harv\|s2cid=181223762\|url-status=dead}}</ref><ref name="Gibney 2017">{{cite journal\|last1=Gibney\|first1=Elizabeth\|year=2017\|title=The quest to crystallize time\|url=http://www.nature.com/news/the-quest-to-crystallize-time-1.21595\|journal=Nature\|volume=543\|issue=7644\|pages=164–166\|bibcode=2017Natur.543..164G\|doi=10.1038/543164a\|issn=0028-0836\|pmid=28277535\|archiveurl=https://archive.istoday/20170313115721/http://www.nature.com/news/the-quest-to-crystallize-time-1.21595\|archivedate=2017-03-13\|ref=harv\|url-status=dead\|s2cid=4460265}}</ref> == Hukum pertama termodinamika == Baris 55: * [[Hukum termodinamika]] * [[Prinsip energik]] * [[Mekanika Lagrangian\|Lagrangian]] * [[Alam semesta tanpa-energi]] Baris 67 ⟶ 65: === Sumber modern === * Goldstein, Martin, and Inge F., (1993). ''The Refrigerator and the Universe''. Harvard Univ. Press. A gentle introduction. * {{cite book \|author1=Kroemer, Herbert \|author2=Kittel, Charles \| title=Thermal Physics (2nd ed.) \|url=https://archive.org/details/thermalphysics0000kitt \| publisher=W. H. Freeman Company \| year=1980 \| isbn=978-0-7167-1088-2 }} * {{cite book \| author=Nolan, Peter J. \| title=Fundamentals of College Physics, 2nd ed. \| publisher=William C. Brown Publishers \| year=1996 \| id=}} * {{cite book \| author=Oxtoby & Nachtrieb \| title=Principles of Modern Chemistry,'' 3rd ed. \| publisher=Saunders College Publishing \| year=1996 \| id=}} * {{cite book \| author=Papineau, D. \| title=Thinking about Consciousness \| url=https://archive.org/details/thinkingaboutcon0000papi \| location=Oxford \| publisher=Oxford University Press \| year=2002 \| id=}} * {{cite book \|author1=Serway, Raymond A. \|author2=Jewett, John W. \| title=Physics for Scientists and Engineers (6th ed.) \| publisher=Brooks/Cole \| year=2004 \| isbn=978-0-534-40842-8 }} * Stenger, Victor J. (2000). ''Timeless Reality''. Prometheus Books. Especially chpt. 12. Nontechnical. * {{cite book \| author=Tipler, Paul \| title=Physics for Scientists and Engineers: Mechanics, Oscillations and Waves, Thermodynamics (5th ed.) \| url=https://archive.org/details/physicsforscient0002tipl \| publisher=W. H. Freeman \| year=2004 \| isbn=978-0-7167-0809-4}} * {{cite book \| author=[[Lanczos]], Cornelius \| title=The Variational Principles of Mechanics \| location= Toronto \| publisher=University of Toronto Press \| year=1970 \| isbn=978-0-8020-1743-7}} Baris 91 ⟶ 89: {{Authority control}} ~~{{fisika-stub}}~~ [[Kategori:Energi (fisika)]]