Pemza (lot. pumex \u2014 g’ovak) \u2014 nor-don vulkan shishasinnng serg’ovak (g’ovakligi 60-70%dan baland) turi. Tarkibida ko’pincha boshqa turli kri- stalli donachalar (plagioklaz, kvars, piroksen va b.) qo’shilgan bo’ladi. Struk- turasi kichik va katta govaklilarga, teksturasi esa tolali, uyali, ko’pikli, qavariqlilarga ajratiladi. Tarkibida FeO va Fe2O3 miqdoriga qarab rangi oq va zangoridan sariq, to’q qizil, qoragacha o’zgaruvchan bo’ladi. Qattiqligi 5-6,5, zichligi 2000-2300 kg\/m3, hajmiy og’irligi 400-900 kg\/m3. Kimyoviy jihatdan inert, o’tga chidamli, 1300\u2014 1400\u00b0 t-Rada yumshaydi. P. yog’och, tosh va me-tallarga abraziv ishlov berishda, kimyo sanoatida filtr va kataliza-tor- lar tayyorlashda, neftni qayta ishlash sanoatida, nitrogliserinli portlovchi moddalar sezgirligini oshirish uchun qo’shimcha sifatida, shisha va yaltiroq bo’yoqlar i.ch.da qo’llaniladi.<\/p>\n","protected":false},"excerpt":{"rendered":"
Pemza (lot. pumex \u2014 g’ovak) \u2014 nor-don vulkan shishasinnng serg’ovak (g’ovakligi 60-70%dan baland) turi. Tarkibida ko’pincha boshqa turli kri- stalli donachalar (plagioklaz, kvars, piroksen va b.) qo’shilgan bo’ladi. Struk- turasi … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":99837,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[226],"tags":[],"class_list":["post-119430","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-p-harfi","entry"],"translation":{"provider":"WPGlobus","version":"3.0.0","language":"kr","enabled_languages":["uz","kr","ru"],"languages":{"uz":{"title":true,"content":true,"excerpt":false},"kr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/119430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/comments?post=119430"}],"version-history":[{"count":1,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/119430\/revisions"}],"predecessor-version":[{"id":119457,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/posts\/119430\/revisions\/119457"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/media\/99837"}],"wp:attachment":[{"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/media?parent=119430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/categories?post=119430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/milliycha.uz\/kr\/wp-json\/wp\/v2\/tags?post=119430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}