{"id":990,"date":"2017-03-08T15:30:49","date_gmt":"2017-03-08T14:30:49","guid":{"rendered":"http:\/\/agora.xtec.cat\/ceipantonigaudi\/?p=990"},"modified":"2020-02-14T14:04:50","modified_gmt":"2020-02-14T13:04:50","slug":"estalactites-estalagmites-i-columnes-de-sal-cs","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/portada\/estalactites-estalagmites-i-columnes-de-sal-cs\/","title":{"rendered":"Taller de ci\u00e8ncies: estalactites, estalagmites i columnes de sal (CS)"},"content":{"rendered":"\r\n\t<div class=\"slideshow_container slideshow_container_style-light\" style=\"height: 300px; \" data-slideshow-id=\"1001\" data-style-name=\"style-light\" data-style-version=\"2.3.1\" >\r\n\r\n\t\t\t\t\t<div class=\"slideshow_loading_icon\"><\/div>\r\n\t\t\r\n\t\t<div class=\"slideshow_content\" style=\"display: none;\">\r\n\r\n\t\t\t<div class=\"slideshow_view\">\r\n\t\t\t\t<div class=\"slideshow_slide slideshow_slide_image\">\r\n\t\t\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-content\/uploads\/usu1588\/2017\/03\/e11-e1488983375602.jpg\" alt=\"e11\" width=\"400\" height=\"300\" \/>\r\n\t\t\t\t\t\t\t\t\t\t<div class=\"slideshow_description_box slideshow_transparent\">\r\n\t\t\t\t\t\t<div class=\"slideshow_title\">e11<\/div>\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t<div style=\"clear: both;\"><\/div><\/div><div class=\"slideshow_view\">\r\n\t\t\t\t<div class=\"slideshow_slide slideshow_slide_image\">\r\n\t\t\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-content\/uploads\/usu1588\/2017\/03\/e22-e1488983393674.jpg\" alt=\"e22\" width=\"400\" height=\"300\" \/>\r\n\t\t\t\t\t\t\t\t\t\t<div class=\"slideshow_description_box slideshow_transparent\">\r\n\t\t\t\t\t\t<div class=\"slideshow_title\">e22<\/div>\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t<div style=\"clear: both;\"><\/div><\/div><div class=\"slideshow_view\">\r\n\t\t\t\t<div class=\"slideshow_slide slideshow_slide_image\">\r\n\t\t\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-content\/uploads\/usu1588\/2017\/03\/e33-e1488983406295.jpg\" alt=\"e33\" width=\"400\" height=\"300\" \/>\r\n\t\t\t\t\t\t\t\t\t\t<div class=\"slideshow_description_box slideshow_transparent\">\r\n\t\t\t\t\t\t<div class=\"slideshow_title\">e33<\/div>\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t<div style=\"clear: both;\"><\/div><\/div><div class=\"slideshow_view\">\r\n\t\t\t\t<div class=\"slideshow_slide slideshow_slide_image\">\r\n\t\t\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-content\/uploads\/usu1588\/2017\/03\/e44-e1488983419351.jpg\" alt=\"e44\" width=\"400\" height=\"300\" \/>\r\n\t\t\t\t\t\t\t\t\t\t<div class=\"slideshow_description_box slideshow_transparent\">\r\n\t\t\t\t\t\t<div class=\"slideshow_title\">e44<\/div>\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t<div style=\"clear: both;\"><\/div><\/div><div class=\"slideshow_view\">\r\n\t\t\t\t<div class=\"slideshow_slide slideshow_slide_image\">\r\n\t\t\t\t\t\t\t\t\t\t\t<img src=\"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-content\/uploads\/usu1588\/2017\/03\/e55-e1488983429932.jpg\" alt=\"e55\" width=\"400\" height=\"300\" \/>\r\n\t\t\t\t\t\t\t\t\t\t<div class=\"slideshow_description_box slideshow_transparent\">\r\n\t\t\t\t\t\t<div class=\"slideshow_title\">e55<\/div>\t\t\t\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t\t\t\t<div style=\"clear: both;\"><\/div><\/div>\r\n\t\t<\/div>\r\n\r\n\t\t<div class=\"slideshow_controlPanel slideshow_transparent\" style=\"display: none;\"><ul><li class=\"slideshow_togglePlay\" data-play-text=\"Visualitza\" data-pause-text=\"Pausa\"><\/li><\/ul><\/div>\r\n\r\n\t\t<div class=\"slideshow_button slideshow_previous slideshow_transparent\" role=\"button\" data-previous-text=\"Anterior\" style=\"display: none;\"><\/div>\r\n\t\t<div class=\"slideshow_button slideshow_next slideshow_transparent\" role=\"button\" data-next-text=\"Seg\u00fcent\" style=\"display: none;\"><\/div>\r\n\r\n\t\t<div class=\"slideshow_pagination\" style=\"display: none;\" data-go-to-text=\"V\u00e9s a la diapositiva\"><div class=\"slideshow_pagination_center\"><\/div><\/div>\r\n\r\n\t\t<!-- WordPress Slideshow Version 2.3.1 -->\r\n\r\n\t\t\t<\/div>\r\n\r\n\n<p>&nbsp;<\/p>\n<div class=\"post-body entry-content\">\n<p>&nbsp;<\/p>\n<p>Quan pensem qu\u00e8 podem trobar dins una cova, una de les primeres coses que ens v\u00e9nen al cap s\u00f3n les conegudes estalactites i estalagmites. Aquestes formacions geol\u00f2giques d\u2019origen calcari, formades b\u00e0sicament de Carbonat de Calci, s\u00f3n conseq\u00fc\u00e8ncia de la circulaci\u00f3 de les aig\u00fces subterr\u00e0nies, que mica a mica van adquirint bicarbonat de calci, i la posterior precipitaci\u00f3 qu\u00edmica dels minerals que pr\u00e8viament s\u2019hi han dissolt.<\/p>\n<p>Quan l\u2019aigua es filtra gota a gota fins al sostre de la cova, tendeix a adherir-se a aquest i a formar gotetes. Quan aquestes perden part de l\u2019aigua i del Di\u00f2xid de carboni, el carbonat de calci precipita formant dip\u00f2sits semblants a caramells (d\u2019aqu\u00ed que, de les estalactites, tamb\u00e9 se les anomeni \u201ccaramells\u201d). A l\u2019escorres m\u00e9s aigua pel sostre, la precipitaci\u00f3 de carbonat de calci continua i els dip\u00f2sits creixen en longitud i amplada constituint les estalactites. Aquestes poden arribar a ser enormes i, en molts casos, adopten formes curioses.<\/p>\n<p>El carbonat de calci pur \u00e9s blanc, per\u00f2 les estalactites acostumen a tenir diferents colors a causa de les impureses que cont\u00e9 el mineral. Part de l\u2019aigua filtrada cau en el terra i s\u2019acumulen masses de carbonat c\u00e0lcic semblants a estalactites invertides. Aquests dip\u00f2sits, que creixen cap amunt des del terra de les coves, s\u2019anomenen estalagmites.<\/p>\n<p>Avui farem una estalactita.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><em><u>Materials<\/u><\/em><\/strong><\/p>\n<ul>\n<li>\u00a0\u00a0\u00a0 Dos gots de vidre<\/li>\n<li>\u00a0\u00a0\u00a0 Aigua calenta suficient per omplir els dos gots<\/li>\n<li>\u00a0\u00a0\u00a0 Un fil o cordill de cot\u00f3 d\u2019uns 35cm (\u00e9s important que no sigui fil sint\u00e8tic)<\/li>\n<li>\u00a0\u00a0\u00a0 Sal de cuina (amb uns 250g en tindrem de sobres)<\/li>\n<li>\u00a0\u00a0\u00a0 Un plat petit (tamb\u00e9 pot servir el tap d\u2019un pot)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><em><u>Procediments i m\u00e8tode:<\/u><\/em><\/strong><\/p>\n<ul>\n<li>\u00a0\u00a0\u00a0 Omplim els gots amb aigua calenta i hi tirem la sal. Remenem fins a aconseguir una dissoluci\u00f3 saturada de sal a tots dos gots.<\/li>\n<li>\u00a0\u00a0\u00a0 Posem el plat petit entre els dos gots.<\/li>\n<li>\u00a0\u00a0\u00a0 Submergim els dos extrems del fil, un a cada got. Procurarem que el fil (entre els dos gots) quedi penjat de tal manera que faci panxa cap en vall.<\/li>\n<li>\u00a0\u00a0\u00a0 Deixem el muntatge fet i en funcionament durant uns 7 dies i observem el qu\u00e8 passa (el proc\u00e9s \u00e9s lent per\u00f2 anir\u00e0 m\u00e9s r\u00e0pid quan m\u00e9s alta sigui la temperatura ambient).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong><em><u>Resultats i conclusions<\/u><\/em><\/strong><\/p>\n<p>La soluci\u00f3 salada puja per capil\u00b7laritat al llarg del fil i cau gota a gota al plat petit. L\u2019aigua de la dissoluci\u00f3<\/p>\n<p>s\u2019evapora lentament per\u00f2 no la sal. Aquesta sal acaba formant cristalls per un proc\u00e9s anomenat<\/p>\n<p>\u201csedimentaci\u00f3 evapor\u00edtica\u201d.<\/p>\n<p>En funci\u00f3 de quines siguin les condicions ambientals, tardarem m\u00e9s o menys o obtenir uns resultats<\/p>\n<p>satisfactoris del nostre experiment. Les temperatures altes augmenten els nivells d\u2019evaporaci\u00f3 i aix\u00f2<\/p>\n<p>n\u2019accelera la sedimentaci\u00f3 salina, i en conseq\u00fc\u00e8ncia la formaci\u00f3 de l\u2019estalactita.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Quan pensem qu\u00e8 podem trobar dins una cova, una de les primeres coses que ens v\u00e9nen al cap s\u00f3n&#8230;<\/p>\n","protected":false},"author":1,"featured_media":993,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[103,4,122],"tags":[],"class_list":["post-990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cilesuperior","category-portada","category-tallers20172019"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/posts\/990","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/comments?post=990"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/posts\/990\/revisions"}],"predecessor-version":[{"id":1162,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/posts\/990\/revisions\/1162"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/media\/993"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/media?parent=990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/categories?post=990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceipantonigaudi\/wp-json\/wp\/v2\/tags?post=990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}