{"id":23723,"date":"2017-04-07T07:20:00","date_gmt":"2017-04-07T05:20:00","guid":{"rendered":"http:\/\/hudo.com\/si\/2016\/04\/07\/zakaj-planet-zemlja-vsako-leto-izgubi-50-000-ton\/"},"modified":"2017-04-20T10:23:22","modified_gmt":"2017-04-20T08:23:22","slug":"zakaj-planet-zemlja-vsako-leto-shujsa-za-50-000-ton","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/lifestyle\/zakaj-planet-zemlja-vsako-leto-shujsa-za-50-000-ton\/","title":{"rendered":"Zakaj planet Zemlja vsako leto &#8216;shuj\u0161a&#8217; za 50.000 ton"},"content":{"rendered":"<figure>\n\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"660\" height=\"320\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" data-src=\"http:\/\/moski.hudo.com\/wp-content\/uploads\/2016\/04\/profimedia-0178112031-320x155.jpg\" data-srcset=\"http:\/\/moski.hudo.com\/wp-content\/uploads\/2016\/04\/profimedia-0178112031-660x320.jpg 660w,http:\/\/moski.hudo.com\/wp-content\/uploads\/2016\/04\/profimedia-0178112031-320x155.jpg 330w\" sizes=\"(max-width: 660px) 100vw, 660px\"\/><figcaption>foto:Profimedia<\/figcaption><\/figure>\n<p>Dr. Chris Smith iz univerze Cambridge je za radijski program More or Less na radijski postaji BBC Radio 4 povedal, da sta s kolegom, fizikom Daveom Anselom pri\u0161la do zanimivih izra\u010dunov. Kljub 40.000 tonam prahu, ki vsako leto postanejo del na\u0161ega planeta, Zemlja letno izgubi 50.000 ton! Poglejmo si nekaj njunih zaklju\u010dkov.<\/p>\n<h2>Kako zemlja pridobiva te\u017eo?<\/h2>\n<p>Zemlja zaradi svoje gravitacijske sile letno pridobi omenjenih 40.000 ton vesoljskega prahu; gre za material, ki je ostal \u0161e iz \u010dasov nastanka na\u0161ega vesolja, ko se je le-to oblikovalo. Zemlja je namre\u010d v celoti sestavljena iz tega materiala.<\/p>\n<h2>Vedno ve\u010d nas je, a te\u017ea ostaja enaka<\/h2>\n<p>Seveda ve\u010d ljudi, postavljenih stolpnic, izdelanih avtomobilov \u2026 ne pomeni pove\u010danje mase planeta, saj smo vsi &#8211; ljudje, \u017eivali in stvari, zgrajeni iz istega, na Zemlji \u017ee prisotnega materiala, ki ga organizmi, na\u0161a industrija in mi sami le preoblikujemo. Tudi rakete in sateliti, ki jih po\u0161iljamo v orbito, v ve\u010dini primerov slej ko prej padejo na Zemljo ali izgorijo v atmosferi, torej ostanejo v tej ali oni obliki na na\u0161em planetu.<\/p>\n<h2>Izgubljanje te\u017ee<\/h2>\n<p>Zemeljska sredica izgublja te\u017eo, saj je ogromen nuklearni reaktor, ki kuri gorivo. Manj energije pomeni manj mase, vsako leto tako sredica izgubi 16 ton. To je malo proti 95.000 tonami vodika in 1.600 tonami helija, ki sta prelahka, da bi ju zemljina gravitacija obdr\u017eala v orbiti, plina enostavno odnese v vesolje.<\/p>\n<p>\u010ce se\u0161tejemo \u0161tevilke, Zemlja torej letno izgubi pribli\u017eno 50.000 ton, kar zna\u0161a 0,000000000000001% njene celotne mase.<\/p>\n<h2>Skrbi so odve\u010d<\/h2>\n<p>Naj nas bo strah, da bo Zemlja naposled izginila? Ni potrebe. Ni nas niti treba biti strah, da bi izgubili preve\u010d vodika. Dovolj ga je, zmanjkalo ga ne bo niti v trilijonu let.<\/p>\n<p>Helij pa je, po drugi strani, druga zgodba. Predstavlja 0,00052 % prostornine na\u0161e atmosfere, ve\u010dinoma ga pridobivamo iz zemeljskega plina s procesom frakcijske destilacije. Helija na na\u0161em planetu po\u010dasi zmanjkuje. Nobelov nagrajenec z univerze Cornell, Robert Richardson, je enkrat dejal, da bi moral imeti vsak otro\u0161ki helijev balon\u010dek ceno 100 USD. Prav tako je nasprotoval odlo\u010ditvi ZDA, da proda svoje zaloge helija in s tem na tr\u017ei\u0161\u010du ohrani ni\u017ejo ceno.<\/p>\n<p>Verjetno ima prav, saj se helij uporablja v mnogih tehni\u010dnih pripomo\u010dkih, npr. v MRI skenerjih, pri \u010demer je hladilna snov za superprevodne magnete, uporablja se za rast kristalov germaniuma in silikona, kot tudi pri proizvodnji titana in cirkona.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Modri planet postaja vsako leto la\u017eji, trdijo britanski znanstveniki. Preveri, zakaj.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[2023,2462],"source":[1522,1518,1552],"supertag":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Zakaj planet Zemlja vsako leto &#8216;shuj\u0161a&#8217; za 50.000 ton - Hudo Slovenija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hudo.com\/si\/lifestyle\/zakaj-planet-zemlja-vsako-leto-shujsa-za-50-000-ton\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zakaj planet Zemlja vsako leto &#8216;shuj\u0161a&#8217; za 50.000 ton - Hudo Slovenija\" \/>\n<meta property=\"og:description\" content=\"Modri planet postaja vsako leto la\u017eji, trdijo britanski znanstveniki. 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