{"id":278,"date":"2014-12-14T11:29:58","date_gmt":"2014-12-14T11:29:58","guid":{"rendered":"http:\/\/\/wpweb\/?page_id=278"},"modified":"2019-10-08T07:50:16","modified_gmt":"2019-10-08T07:50:16","slug":"els-nuvols","status":"publish","type":"page","link":"https:\/\/www.meteo.cat\/wpweb\/divulgacio\/conceptes-generals\/els-nuvols\/","title":{"rendered":"Els n\u00favols"},"content":{"rendered":"<p>Per a que es formi un n\u00favol, doncs, cal que la humitat de l\u2019aire sigui prou alta, i aix\u00f2 es pot aconseguir de dues maneres: augmentant la quantitat de vapor d\u2019aigua o fent baixar la temperatura.<\/p>\n<p>Un augment del vapor d\u2019aigua es pot donar prop del mar, d\u2019un riu o d\u2019un llac, i pot ajudar a que es formi boira. Per\u00f2 el m\u00e9s freq\u00fcent \u00e9s que l\u2019aire humit es refredi, de forma que la humitat puja sense augmentar la quantitat de vapor (ja que l\u2019aire fred \u00e9s capa\u00e7 de contenir menys vapor d\u2019aigua que l\u2019aire calent).<\/p>\n<p><strong>I com es refreda l\u2019aire a la pr\u00e0ctica?<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Doncs de tres formes:<\/p>\n<p>La primera: a la nit amb el refredament que es produeix quan no fa sol. Aix\u00ed es formen la major part de les boires.<\/p>\n<p>La segona: quan una massa d\u2019aire passa sobre una superf\u00edcie freda. Aix\u00ed es formen algunes menes de boira.<\/p>\n<p>La tercera, i m\u00e9s important: per l\u2019ascens de l\u2019aire. Quan una massa d\u2019aire puja arriba a llocs on la pressi\u00f3 atmosf\u00e8rica (el pes de la columna d\u2019aire que t\u00e9 al damunt) \u00e9s m\u00e9s baixa. Aleshores s\u2019expandeix (passa a ocupar m\u00e9s volum) i es refreda. Aix\u00ed \u00e9s comes formen generalment els n\u00favols.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Per a que es formi un n\u00favol, doncs, cal que la humitat de l\u2019aire sigui prou alta, i aix\u00f2 es pot aconseguir de dues maneres: augmentant la quantitat de vapor d\u2019aigua o fent baixar la temperatura. Un augment del vapor d\u2019aigua es pot donar prop del mar, d\u2019un riu o d\u2019un llac, i pot ajudar [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":126,"menu_order":0,"comment_status":"closed","ping_status":"closed","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\/278"}],"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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/comments?post=278"}],"version-history":[{"count":5,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/278\/revisions"}],"predecessor-version":[{"id":11924,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/278\/revisions\/11924"}],"up":[{"embeddable":true,"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/pages\/126"}],"wp:attachment":[{"href":"https:\/\/www.meteo.cat\/wpweb\/wp-json\/wp\/v2\/media?parent=278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}