{"id":21028239,"date":"2019-12-05T12:45:00","date_gmt":"2019-12-05T11:45:00","guid":{"rendered":"http:\/\/znanost.geek.hr\/?p=21028239"},"modified":"2020-02-24T21:40:22","modified_gmt":"2020-02-24T20:40:22","slug":"sto-se-dogada-ako-zapalimo-svijecu-u-svemiru","status":"publish","type":"post","link":"https:\/\/geek.hr\/znanost\/clanak\/sto-se-dogada-ako-zapalimo-svijecu-u-svemiru\/","title":{"rendered":"\u0160to se doga\u0111a ako zapalimo svije\u0107u u svemiru?"},"content":{"rendered":"\n<p>Svi smo vi\u0111ali filmove u kojima vatra gori u dubinama svemira, a ve\u0107ina vjerojatno u filmu \u201eGravitacija\u201d iz 2013. godine, u kojem se, osim tinjaju\u0107eg Georgea Clooneyja, mo\u017ee vidjeti i vatra koja pro\u017edire svemirsku postaju.<\/p>\n\n\n\n<p>No, kako se vatra zapravo pona\u0161a u mikrogravitaciji? NASA-ini znanstvenici se, sre\u0107om, pitaju to isto ve\u0107 godinama. Od 2009. godine istra\u017eiva\u010di na Me\u0111unarodnoj svemirskoj postaji (ISS) stalno provode eksperiment ga\u0161enja plamena (FLEX) kojim poku\u0161avaju otkriti kako \u0107e se plamen pona\u0161ati u svemiru i, jo\u0161 va\u017enije, kako ga ugasiti.<\/p>\n\n\n\n<p>\u010cim upalite svije\u0107u, plamen \u0107e se formirati u klasi\u010dan oblik suze. No, to je samo zbog gravitacije. Dok vatra tro\u0161i kisik, topli zrak se podi\u017ee, a hladni nesagoreni zrak spu\u0161ta se na dno. No, bez gravitacije nema razdvajanja toplog i hladnog zraka, stoga vatra gori jednako u svim smjerovima, \u0161to stvara sporogore\u0107i svijet sagorijevanja.<\/p>\n\n\n\n<p>Za\u010du\u0111uju\u0107e, pomo\u0107u eksperimenta ga\u0161enja plamena otkriveno je da se sagorijevanje mo\u017ee dogoditi i bez pojave vidljivog plamena.<\/p>\n\n\n\n<p>U ovoj epizodi <em>DNews<\/em>-a mo\u017eete vidjeti divnu i jo\u0161 neobi\u010dniju demonstraciju gorenja u svemiru:<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How Fire Burns in Space\" width=\"880\" height=\"495\" src=\"https:\/\/www.youtube.com\/embed\/9zdD7lfB0Fs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Svi smo vi\u0111ali filmove u kojima vatra gori u dubinama svemira, a ve\u0107ina vjerojatno u filmu \u201eGravitacija\u201d iz 2013. godine, u kojem se, osim tinjaju\u0107eg Georgea Clooneyja, mo\u017ee vidjeti i vatra koja pro\u017edire svemirsku postaju. No, kako se vatra zapravo pona\u0161a u mikrogravitaciji? NASA-ini znanstvenici se, sre\u0107om, pitaju to isto ve\u0107 godinama. Od 2009. godine [&hellip;]<\/p>\n","protected":false},"author":10022,"featured_media":21028708,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[16323],"tags":[18006,21132,17127],"class_list":["post-21028239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-svemir","tag-svemir-2","tag-svijeca","tag-vatra"],"modified_by":null,"_links":{"self":[{"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/posts\/21028239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/users\/10022"}],"replies":[{"embeddable":true,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/comments?post=21028239"}],"version-history":[{"count":0,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/posts\/21028239\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/media\/21028708"}],"wp:attachment":[{"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/media?parent=21028239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/categories?post=21028239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/geek.hr\/znanost\/wp-json\/wp\/v2\/tags?post=21028239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}