{"id":5064,"date":"2017-04-24T09:11:11","date_gmt":"2017-04-24T07:11:11","guid":{"rendered":"http:\/\/serveiseducatius.xtec.cat\/baixcamp\/?p=5064"},"modified":"2017-04-24T09:34:31","modified_gmt":"2017-04-24T07:34:31","slug":"granulometria-aireig-i-retencio-daigua","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/baixcamp\/tastet\/granulometria-aireig-i-retencio-daigua\/","title":{"rendered":"Granulometria: aireig i retenci\u00f3 d&#8217;aigua"},"content":{"rendered":"<p>La <strong>granulometria<\/strong> \u00e9s la distribuci\u00f3 de part\u00edcules d&#8217;acord a la seva mida.<br \/>\nAquest par\u00e0metre condiciona la porositat d&#8217;aire i la retenci\u00f3 d&#8217;aigua.<\/p>\n<h6><strong>Qu\u00e8 pret\u00e9n l&#8217;experiment?<\/strong><\/h6>\n<p>En aquest experiment es vol demostrar com la mida de les part\u00edcules d&#8217;un s\u00f2l mineral o d&#8217;un substrat org\u00e0nic determina el drenatge i la retenci\u00f3 d&#8217;aigua.<\/p>\n<h6><strong>Qu\u00e8 hem fet?<\/strong><\/h6>\n<p>Es fan servir sedassos de diferent mida de llum per tal de granular el substrat.<\/p>\n<p>En una proveta hi posem bales d&#8217;una mida i en una altra proveta hi fiquem bales d&#8217;una mida m\u00e9s gran. En totes dues provetes hi ha el mateix volum de bales. Hi posem aigua acolorida per determinar el volum d&#8217;espai por\u00f3s. A on hi cap m\u00e9s aigua ? Comprovem-ho!<\/p>\n<p>Hem utilitzat el mateix volum d&#8217;aigua acolorida. Per tant, quan la part\u00edcula \u00e9s esf\u00e8rica es demostra que el volum d&#8217;espai por\u00f3s \u00e9s el mateix. Ara fem el mateix experiment per\u00f2 amb part\u00edcules irregulars com ara fesols sencers i fesols trinxats. El mateix volum a totes dues provetes. A on hi posarem m\u00e9s aigua acolorida? Fem-ho!<\/p>\n<p>Es demostra, al contrari del que es podria pensar en un primer moment, que hi cap m\u00e9s aigua a la proveta que t\u00e9 els fesols trinxats. \u00c9s a dir, que hi ha m\u00e9s espai por\u00f3s.<\/p>\n<div style=\"width: 854px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-5064-1\" width=\"854\" height=\"480\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"http:\/\/serveiseducatius.xtec.cat\/baixcamp\/wp-content\/uploads\/usu950\/2017\/03\/GRANULOMETRIA.-INS-HORTICULTURA-I-JARDINERIA-REUS.mp4?_=1\" \/><a href=\"http:\/\/serveiseducatius.xtec.cat\/baixcamp\/wp-content\/uploads\/usu950\/2017\/03\/GRANULOMETRIA.-INS-HORTICULTURA-I-JARDINERIA-REUS.mp4\">http:\/\/serveiseducatius.xtec.cat\/baixcamp\/wp-content\/uploads\/usu950\/2017\/03\/GRANULOMETRIA.-INS-HORTICULTURA-I-JARDINERIA-REUS.mp4<\/a><\/video><\/div>\n<h6><strong>Conclusions<\/strong><\/h6>\n<p>S&#8217;ha vist que quant m\u00e9s grans s\u00f3n les part\u00edcules, hi ha m\u00e9s macroporositat, \u00e9s a dir, m\u00e9s porus grans que determinen el drenatge. Quant m\u00e9s petites s\u00f3n les part\u00edcules hi ha m\u00e9s microporositat, \u00e9s a dir, m\u00e9s porus petits que condicionen la retenci\u00f3 d&#8217;aigua. Quan les part\u00edcules s\u00f3n esf\u00e8riques la mida de la part\u00edcula, o granulometria, no decideix sobre la porositat d&#8217;aire ni sobre la retenci\u00f3 d&#8217;aigua.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Experiment que demostra com la mida de les part\u00edcules d&#8217;un s\u00f2l mineral o d&#8217;un substrat org\u00e0nic determina el drenatge i la retenci\u00f3 d&#8217;aigua<\/p>\n","protected":false},"author":124,"featured_media":5443,"comment_status":"open","ping_status":"open","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 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