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Kali ini kita membahas wujud zat keempat setelah padat, cair dan gas yaitu plasma. Plasma adalah gas terionisasi yaitu gas yang kehilangan elektron luarnya akibat pemanasan yang sangat tinggi. Berbeda dengan gas, plasma bersifat menghantarkan listrik dan dapat dipengaruhi oleh medan magnet. Contoh plasma dalam kehidupan sehari-hari bisa kita lihat antara lain di lampu TL/neon, TV plasma, bola plasma, gas buang roket dan reaktor fusi nuklir. Plama juga merupakan bentuk dari fenomena alam petir, aurora dan upper athmosferic lightning. Di antariksa, plasma merupakan bentuk zat yang paling umum ditemukan yaitu pada matahari dan bintang, angin surya, medium antar planet, medium antar bintang, medium antar galaksi, piringan akresi dan nebula antar bintang. Sumber video: videvo.net Sumber gambar: Tony Hisgett from Birmingham, UK, CC BY 2.0, via Wikimedia Commons plasma ball Don DeBold from San Jose, CA, USA, CC BY 2.0, via Wikimedia Commons The original uploader was Iantresman at English Wikipedia., CC BY 2.5, via Wikimedia Commons plasma from tesla coil AngeloBi, CC BY 4.0, via Wikimedia Commons plasma creation Themarnicle, CC BY 4.0, via Wikimedia Commons plasma tree Shunsuke Kobayashi, CC BY 2.0, via Wikimedia Commons panasonic plasma tv Dave Jones from Australia, CC BY 2.0, via Wikimedia Commons samsung plasma tv Ivan Bok, CC BY 4.0, via Wikimedia Commons orion nebula Hubble image: NASA, ESA, N. Smith (University of California, Berkeley), and The Hubble Heritage Team (STScI/AURA)CTIO data: N. Smith (University of California, Berkeley) and NOAO/AURA/NSF, Public domain, via Wikimedia Commons eta carinae nebula Christian Taube, CC BY-SA 2.0 de, via Wikimedia Commons lampu tl European Space Agency, CC BY 2.0, via Wikimedia Commons the veil nebula Eye Steel Film from Canada, CC BY 2.0, via Wikimedia Commons general fusion plasma injector Eye Steel Film from Canada, CC BY 2.0, via Wikimedia Commons plasma mast tokamak EUROfusion, CC BY 4.0, via Wikimedia Commons EUROfusion diagram power plant http://interstellar.jpl.nasa.gov/interstellar/probe/introduction/scale.html, Domain Publik, via Wikimedia Commons interstar medium Senior Airman Brian KellyVIRIN: 170322-F-ZZ999-002E.JPG, Public domain, via Wikimedia Commons Anynobody, CC BY-SA 3.0, via Wikimedia Commons BA 9 New work Alchemist-hp (talk) www.pse-mendelejew.de); original single images: Jurii, http://images-of-elements.com., CC BY 3.0, via Wikimedia Commons glowing noble gases Abestrobi - Own work, CC BY-SA 3.0, via Wikimedia Commons upper atmospheric phenomenon Denis huber - Own work, CC BY-SA 4.0, via Wikimedia Commons sprites Welias - Own work, CC BY-SA 4.0, sprites argentina International Gemini Observatory/NOIRLab/NSF/AURA/A. Smith - https://noirlab.edu/public/images/iotw2108a/, CC BY 4.0, gigantic jet mauna kea http://interstellar.jpl.nasa.gov/interstellar/probe/introduction/scale.html, Domain Publik, heliosphere dan medium antar bintang By NASA, ESA, and E. Hallman (University of Colorado, Boulder) - http://www.nasa.gov/mission_pages/hubble/science/hst_img_20080520.html, Public Domain, structure of the universe By Event Horizon Telescope, uploader cropped and converted TIF to JPG - https://www.eso.org/public/images/eso1907a/ (image link) The highest-quality image (7416x4320 pixels, TIF, 16-bit, 180 Mb), ESO Article, ESO TIF, CC BY 4.0, via Wikimedia Commons Disk at the blackhole in the center of messier 87 By Tudor - Own work, CC BY-SA 4.0, via Wikimedia Commons accretion disk By NASA/JPL-Caltech - http://www.nasa.gov/mission_pages/nustar/multimedia/pia16695.html, Public Domain, via Wikimedia Commons black hole with corona Oleh NASA and The Hubble Heritage Team (AURA/STScI) - http://hubblesite.org/newscenter/archive/releases/2003/30/image/b/ (direct link), Domain Publik, via Wikimedia Commons ngc 604 Oleh NASA, ESA, J. Hester and A. Loll (Arizona State University) - HubbleSite: gallery, release., Domain Publik, via Wikimedia Commons nebula kepiting Oleh NASA and The Hubble Heritage Team (STScI/AURA); Acknowledgment: W. Sparks (STScI) and R. Sahai (JPL) - https://hubblesite.org/contents/media/images/2003/09/1305-Image.html, Domain Publik, via Wikimedia Commons nebula telur