{"id":48745,"date":"2019-11-12T01:48:21","date_gmt":"2019-11-12T00:48:21","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-pressao-negativa-de-manometro-pressao-de-vacuo-definicao\/"},"modified":"2020-01-30T11:32:26","modified_gmt":"2020-01-30T10:32:26","slug":"o-que-e-pressao-negativa-de-manometro-pressao-de-vacuo-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-pressao-negativa-de-manometro-pressao-de-vacuo-definicao\/","title":{"rendered":"O que \u00e9 press\u00e3o negativa de man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Press\u00e3o negativa do man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo. Quando a press\u00e3o atmosf\u00e9rica local \u00e9 maior que a press\u00e3o no sistema, o termo press\u00e3o de v\u00e1cuo \u00e9 usado. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/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>O que \u00e9 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:<\/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>Press\u00e3o manom\u00e9trica negativa &#8211; Press\u00e3o de v\u00e1cuo<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/absolute-vs.-gauge-pressure.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-16281 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/absolute-vs.-gauge-pressure.png\" alt=\"press\u00e3o absoluta versus man\u00f4metro\" width=\"388\" height=\"247\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/absolute-vs.-gauge-pressure.png\" \/><\/a><strong><span>Press\u00e3o negativa do man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo.\u00a0<\/span><\/strong><span>Quando a press\u00e3o atmosf\u00e9rica local \u00e9 maior que a press\u00e3o no sistema, o termo\u00a0<\/span><strong><span>press\u00e3o de v\u00e1cuo<\/span><\/strong><span>\u00a0\u00e9 usado.\u00a0Um v\u00e1cuo perfeito corresponderia \u00e0 press\u00e3o zero absoluta.\u00a0Certamente \u00e9 poss\u00edvel ter uma press\u00e3o manom\u00e9trica negativa, mas n\u00e3o \u00e9 poss\u00edvel ter uma press\u00e3o absoluta negativa.\u00a0Por exemplo, uma press\u00e3o absoluta de 80 kPa pode ser descrita como uma press\u00e3o manom\u00e9trica de -21 kPa (ou seja, 21 kPa abaixo de uma press\u00e3o atmosf\u00e9rica de 101 kPa).<\/span><\/p>\n<p><em><span>p\u00a0<\/span><\/em><em><sub><span>v\u00e1cuo<\/span><\/sub><\/em><em><span>\u00a0= p\u00a0<\/span><\/em><em><sub><span>absoluto;\u00a0atm<\/span><\/sub><\/em><em><span>\u00a0&#8211; p\u00a0<\/span><\/em><em><sub><span>absoluto<\/span><\/sub><\/em><\/p>\n<p><span>Por exemplo,\u00a0<\/span><span>turbinas a<\/span><span>\u00a0vapor de condensa\u00e7\u00e3o\u00a0\u00a0(em\u00a0<a title=\"Usina nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/\">usinas nucleares<\/a>\u00a0) descarregam o\u00a0<a title=\"Propriedades do Steam - O que \u00e9 o Steam\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-steam-propriedades-do-steam-definicao\/\">vapor<\/a>\u00a0a uma press\u00e3o bem abaixo da atmosf\u00e9rica\u00a0<\/span><span>(por exemplo, a 0,08 bar ou 8 kPa ou 1,16 psia)\u00a0<\/span><span>e em um estado parcialmente condensado.\u00a0Em unidades relativas, \u00e9 uma press\u00e3o manom\u00e9trica negativa de cerca de &#8211; 0,92 bar, &#8211; 92 kPa ou &#8211; 13,54 psig.<\/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>Press\u00e3o negativa do man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo. Quando a press\u00e3o atmosf\u00e9rica local \u00e9 maior que a press\u00e3o no sistema, o termo press\u00e3o de v\u00e1cuo \u00e9 usado. Engenharia T\u00e9rmica O que \u00e9 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 &#8230; <a title=\"O que \u00e9 press\u00e3o negativa de man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-pressao-negativa-de-manometro-pressao-de-vacuo-definicao\/\" aria-label=\"More on O que \u00e9 press\u00e3o negativa de man\u00f4metro &#8211; Press\u00e3o de v\u00e1cuo &#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 press\u00e3o negativa de man\u00f4metro - Press\u00e3o de v\u00e1cuo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Press\u00e3o negativa do man\u00f4metro - Press\u00e3o de v\u00e1cuo. 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