{"id":1797,"date":"2014-11-25T10:47:46","date_gmt":"2014-11-25T10:47:46","guid":{"rendered":"http:\/\/\/wpweb\/?page_id=1797"},"modified":"2020-10-29T09:05:16","modified_gmt":"2020-10-29T09:05:16","slug":"mesura-de-la-pressio-atmosferica","status":"publish","type":"page","link":"https:\/\/www.meteo.cat\/wpweb\/divulgacio\/equipaments-meteorologics\/estacions-meteorologiques-automatiques\/funcionament-ema\/mesura-de-la-pressio-atmosferica\/","title":{"rendered":"Mesura de la pressi\u00f3 atmosf\u00e8rica"},"content":{"rendered":"\n<p>S&#8217;anomena pressi\u00f3 atmosf\u00e8rica a la for\u00e7a exercida per unitat de superf\u00edcie per l&#8217;atmosfera terrestre. En el Sistema Internacional de mesura la unitat de pressi\u00f3 \u00e9s el Pascal (Pa). Per aquest motiu la pressi\u00f3 atmosf\u00e8rica s&#8217;expressa en hectoPascals (hPa), malgrat que encara s&#8217;empreen els milibars (mbar), que s\u00f3n equivalents: 1 hPa = 1 mbar.<\/p>\n\n\n\n<p>Per a la mesura de la pressi\u00f3 atmosf\u00e8rica s&#8217;utilitzen bar\u00f2metres capacitius, de quars, piezoel\u00e8ctrics i d&#8217;altres.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"https:\/\/static-m.meteo.cat\/wordpressweb\/wp-content\/uploads\/2014\/11\/25104746\/mesures_pressio_atmosferica_1_junt.jpg\"><img loading=\"lazy\" width=\"400\" height=\"200\" src=\"https:\/\/static-m.meteo.cat\/wordpressweb\/wp-content\/uploads\/2014\/11\/25104746\/mesures_pressio_atmosferica_1_junt.jpg\" alt=\"Exemple aparells de mesura de la pressi\u00f3 atmosf\u00e8rica\" class=\"wp-image-2210\" \/><\/a><\/figure><\/div>\n\n\n\n<p>Amb tot, molts d&#8217;aquests sensors es basen en la variaci\u00f3 d&#8217;un diafragma flexible, que es deforma en funci\u00f3 de la pressi\u00f3 aplicada.<\/p>\n\n\n\n<p>La deformaci\u00f3 del diafragma s&#8217;amplifica i es transforma normalment en un valor de voltatge (0 \u2013 1 V) o d&#8217;intensitat (4 \u2013 20 mA) proporcional a la pressi\u00f3 atmosf\u00e8rica.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S&#8217;anomena pressi\u00f3 atmosf\u00e8rica a la for\u00e7a exercida per unitat de superf\u00edcie per l&#8217;atmosfera terrestre. En el Sistema Internacional de mesura la unitat de pressi\u00f3 \u00e9s el Pascal (Pa). Per aquest motiu la pressi\u00f3 atmosf\u00e8rica s&#8217;expressa en hectoPascals (hPa), malgrat que encara s&#8217;empreen els milibars (mbar), que s\u00f3n equivalents: 1 hPa = 1 mbar. Per a [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":1769,"menu_order":3,"comment_status":"closed","ping_status":"open","template":"template-sidebar.php","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"_links":{"self":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1797"}],"collection":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/comments?post=1797"}],"version-history":[{"count":7,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1797\/revisions"}],"predecessor-version":[{"id":29702,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1797\/revisions\/29702"}],"up":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/1769"}],"wp:attachment":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/media?parent=1797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}