{"id":48613,"date":"2019-11-11T08:02:10","date_gmt":"2019-11-11T07:02:10","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-formula-de-pressao-equacao-de-pressao-definicao\/"},"modified":"2020-01-29T17:04:54","modified_gmt":"2020-01-29T16:04:54","slug":"o-que-e-a-formula-de-pressao-equacao-de-pressao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-formula-de-pressao-equacao-de-pressao-definicao\/","title":{"rendered":"O que \u00e9 a f\u00f3rmula de press\u00e3o &#8211; Equa\u00e7\u00e3o de press\u00e3o &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">F\u00f3rmula de Press\u00e3o &#8211; Equa\u00e7\u00e3o de Press\u00e3o. Press\u00e3o \u00e9 uma medida da for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>F\u00f3rmula de Press\u00e3o &#8211; Equa\u00e7\u00e3o de Press\u00e3o<\/span><\/h2>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Manometer-Pressure-Measurement.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16368 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Manometer-Pressure-Measurement-235x300.png\" alt=\"man\u00f4metro-press\u00e3o-medida\" width=\"235\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Manometer-Pressure-Measurement-235x300.png\" \/><\/a><span>Press\u00e3o<\/span><\/strong><span>\u00a0\u00e9 uma medida da\u00a0<\/span><strong><span>for\u00e7a exercida<\/span><\/strong><span>\u00a0por unidade de \u00e1rea nos limites de uma subst\u00e2ncia.\u00a0A unidade padr\u00e3o de\u00a0<\/span><strong><span>press\u00e3o<\/span><\/strong><span>\u00a0no sistema SI \u00e9 o\u00a0<\/span><strong><span>Newton por metro quadrado ou pascal (Pa)<\/span><\/strong><span>\u00a0.\u00a0Matematicamente (f\u00f3rmula de press\u00e3o):<\/span><\/p>\n<p><strong><span>p = F \/ A<\/span><\/strong><\/p>\n<p><span>Onde<\/span><\/p>\n<ul>\n<li><strong><span>p \u00e9 a press\u00e3o<\/span><\/strong><\/li>\n<li><strong><span>F \u00e9 a for\u00e7a normal<\/span><\/strong><\/li>\n<li><strong><span>A \u00e9 a \u00e1rea do limite<\/span><\/strong><\/li>\n<\/ul>\n<p><span>Pascal \u00e9 definido como a for\u00e7a de 1N exercida na \u00e1rea da unidade.<\/span><\/p>\n<ul>\n<li><strong><span>1 Pascal = 1 N \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\"><span>No entanto, para a maioria dos problemas de engenharia, \u00e9 uma unidade relativamente pequena, portanto, \u00e9 conveniente trabalhar com m\u00faltiplos do pascal: o\u00a0<\/span><strong><span>kPa<\/span><\/strong><span>\u00a0, a\u00a0<\/span><strong><span>barra<\/span><\/strong><span>\u00a0e o\u00a0<\/span><strong><span>MPa<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<ul>\n<li><strong><span>1 MPa 10\u00a0<\/span><sup><span>6<\/span><\/sup><span>\u00a0N \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/li>\n<li><strong><span>1 bar 10\u00a0<\/span><sup><span>5<\/span><\/sup><span>\u00a0N \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/li>\n<li><strong><span>1 kPa 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0N \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/li>\n<\/ul>\n<p><span>Em geral, a press\u00e3o ou a for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia \u00e9 causada pelas\u00a0<\/span><strong><span>colis\u00f5es<\/span><\/strong><span>\u00a0das\u00a0<\/span><strong><span>mol\u00e9culas<\/span><\/strong><span>\u00a0da subst\u00e2ncia com os limites do sistema.\u00a0Quando as mol\u00e9culas atingem as paredes, elas exercem for\u00e7as que tentam empurrar as paredes para fora.\u00a0As for\u00e7as resultantes de todas essas colis\u00f5es causam a\u00a0<\/span><strong><span>press\u00e3o<\/span><\/strong><span>\u00a0exercida por um sistema em seu entorno.\u00a0A press\u00e3o como\u00a0<\/span><a title=\"Propriedades extensivas e intensivas\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/extensive-and-intensive-properties\/\"><strong><span>vari\u00e1vel intensiva<\/span><\/strong>\u00a0<\/a><span>\u00e9 constante em um sistema fechado.\u00a0Realmente s\u00f3 \u00e9 relevante em sistemas l\u00edquidos ou gasosos.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/What-is-Pressure.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-16371 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/What-is-Pressure-300x129.png\" alt=\"O que \u00e9 press\u00e3o\" width=\"300\" height=\"129\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/What-is-Pressure-300x129.png\" \/><\/a><span>[snippet xyz-ihs = \u201dpress\u00e3o\u201d]<\/span><\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Lei do g\u00e1s ideal<\/span><\/h2>\n<p><span>Qualquer equa\u00e7\u00e3o que relacione a press\u00e3o, a temperatura e o volume espec\u00edfico de uma subst\u00e2ncia \u00e9 chamada de\u00a0<\/span><strong><span>equa\u00e7\u00e3o de estado<\/span><\/strong><span>\u00a0.\u00a0A\u00a0equa\u00e7\u00e3o de estado\u00a0mais simples e\u00a0<\/span><strong><span>mais conhecida<\/span><\/strong><span>\u00a0para subst\u00e2ncias na fase gasosa \u00e9 a\u00a0<\/span><strong><span>equa\u00e7\u00e3o<\/span><\/strong><span>\u00a0de estado do\u00a0<strong>g\u00e1s ideal<\/strong>\u00a0.\u00a0Foi declarado pela primeira vez por \u00c9mile Clapeyron em 1834 como uma combina\u00e7\u00e3o da lei emp\u00edrica de Boyle, da lei de Charles e da lei de Avogadro.\u00a0Esta equa\u00e7\u00e3o prev\u00ea o\u00a0<\/span><strong><span>comportamento pvT<\/span><\/strong><span>\u00a0de um g\u00e1s com bastante precis\u00e3o para gases dilu\u00eddos ou de baixa press\u00e3o.\u00a0Num g\u00e1s ideal, as mol\u00e9culas n\u00e3o t\u00eam volume e n\u00e3o interagem.\u00a0De acordo com a lei ideal dos gases, a press\u00e3o varia linearmente com a\u00a0<\/span><strong><span>temperatura<\/span><\/strong><span>\u00a0e a\u00a0<\/span><strong><span>quantidade<\/span><\/strong><span>\u00a0e inversamente com o\u00a0<\/span><strong><span>volume<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><strong><i><span>pV = nRT<\/span><\/i><\/strong><\/p>\n<p><span>Onde:<\/span><\/p>\n<ul>\n<li><strong><em><span>p<\/span><\/em><\/strong><span>\u00a0\u00e9 a<\/span><strong><span>\u00a0press\u00e3o absoluta<\/span><\/strong><span>\u00a0do g\u00e1s<\/span><\/li>\n<li><strong><em><span>n<\/span><\/em><\/strong><span>\u00a0\u00e9 a<\/span><strong><span>\u00a0quantidade<\/span><\/strong><span>\u00a0de subst\u00e2ncia<\/span><\/li>\n<li><strong><em><span>T<\/span><\/em><\/strong><span>\u00a0\u00e9 a<\/span><strong><span>\u00a0temperatura absoluta<\/span><\/strong><\/li>\n<li><strong><em><span>V<\/span><\/em><\/strong><span>\u00a0\u00e9 o<\/span><strong><span>\u00a0volume<\/span><\/strong><\/li>\n<li><strong><em><span>R<\/span><\/em>\u00a0<\/strong><span>\u00a0\u00e9 a<\/span><strong><span>\u00a0constante de g\u00e1s<\/span><\/strong><span>\u00a0ideal, ou universal,igual ao produto da constante de Boltzmann e da constante de Avogadro,<\/span><\/li>\n<\/ul>\n<p><span>Nesta equa\u00e7\u00e3o, o s\u00edmbolo R \u00e9 uma constante chamada constante\u00a0<\/span><strong><span>universal de g\u00e1s<\/span><\/strong><span>\u00a0que tem o mesmo valor para todos os gases &#8211; ou seja,\u00a0<\/span><strong><span>R = 8,31 J \/ mol K.<\/span><\/strong><\/p>\n<p><span>O poder da lei do g\u00e1s ideal est\u00e1 em sua\u00a0<\/span><strong><span>simplicidade<\/span><\/strong><span>\u00a0.\u00a0Quando quaisquer\u00a0<\/span><strong><span>duas<\/span><\/strong><span>\u00a0das vari\u00e1veis \u200b\u200btermodin\u00e2micas, p, ve T\u00a0<\/span><strong><span>s\u00e3o\u00a0<\/span><\/strong><strong><span>dadas<\/span><\/strong><span>\u00a0, a\u00a0<\/span><strong><span>terceira<\/span><\/strong><span>\u00a0pode\u00a0<\/span><strong><span>ser facilmente encontrada<\/span><\/strong><span>.\u00a0Um g\u00e1s ideal \u00e9 definido como aquele em que todas as colis\u00f5es entre \u00e1tomos ou mol\u00e9culas s\u00e3o perfeitamente el\u00e1sticas e nas quais n\u00e3o h\u00e1 for\u00e7as de atra\u00e7\u00e3o intermoleculares.\u00a0Um g\u00e1s ideal pode ser visualizado como uma cole\u00e7\u00e3o de esferas perfeitamente duras que colidem, mas que de outra forma n\u00e3o interagem umas com as outras.\u00a0Na realidade, nenhum g\u00e1s real \u00e9 como um g\u00e1s ideal e, portanto, nenhum g\u00e1s real segue completamente a lei ou a equa\u00e7\u00e3o do g\u00e1s ideal.\u00a0Em temperaturas pr\u00f3ximas ao ponto de ebuli\u00e7\u00e3o dos gases, o aumento da press\u00e3o causa a condensa\u00e7\u00e3o e diminui drasticamente o volume.\u00a0Em press\u00f5es muito altas, as for\u00e7as intermoleculares de um g\u00e1s s\u00e3o significativas.\u00a0No entanto, a maioria dos gases est\u00e1 de acordo aproximado a press\u00f5es e temperaturas acima do seu ponto de ebuli\u00e7\u00e3o.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>F\u00f3rmula de Press\u00e3o &#8211; Equa\u00e7\u00e3o de Press\u00e3o. Press\u00e3o \u00e9 uma medida da for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia. Engenharia T\u00e9rmica F\u00f3rmula de Press\u00e3o &#8211; Equa\u00e7\u00e3o de Press\u00e3o Press\u00e3o\u00a0\u00e9 uma medida da\u00a0for\u00e7a exercida\u00a0por unidade de \u00e1rea nos limites de uma subst\u00e2ncia.\u00a0A unidade padr\u00e3o de\u00a0press\u00e3o\u00a0no sistema SI \u00e9 o\u00a0Newton por metro quadrado &#8230; <a title=\"O que \u00e9 a f\u00f3rmula de press\u00e3o &#8211; Equa\u00e7\u00e3o de press\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-formula-de-pressao-equacao-de-pressao-definicao\/\" aria-label=\"More on O que \u00e9 a f\u00f3rmula de press\u00e3o &#8211; Equa\u00e7\u00e3o de press\u00e3o &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 a f\u00f3rmula de press\u00e3o - Equa\u00e7\u00e3o de press\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"F\u00f3rmula de Press\u00e3o - Equa\u00e7\u00e3o de Press\u00e3o. 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