{"id":48621,"date":"2019-11-11T08:43:27","date_gmt":"2019-11-11T07:43:27","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-unidade-de-pressao-si-definicao\/"},"modified":"2020-01-29T17:09:09","modified_gmt":"2020-01-29T16:09:09","slug":"o-que-e-unidade-de-pressao-si-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-unidade-de-pressao-si-definicao\/","title":{"rendered":"O que \u00e9 unidade de press\u00e3o SI &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Unidade de Press\u00e3o SI &#8211; Pascal &#8211; kg \/ m.s2 &#8211; N \/ m2. A unidade SI de press\u00e3o e estresse \u00e9 o pascal. Uma atmosfera t\u00e9cnica \u00e9 uma unidade de press\u00e3o n\u00e3o SI igual a um quilograma-for\u00e7a por cent\u00edmetro quadrado. 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>Unidade de Press\u00e3o SI &#8211; Pascal &#8211; kg \/ ms\u00a0<\/span><sup><span>2<\/span><\/sup><\/h2>\n<h2><span>Pascal &#8211; Unidade de Press\u00e3o<\/span><\/h2>\n<p><span>Como foi discutido, a\u00a0<\/span><strong><span>unidade SI<\/span><\/strong><span>\u00a0de\u00a0<\/span><strong><span>press\u00e3o<\/span><\/strong><span>\u00a0e estresse \u00e9 o\u00a0<\/span><strong><span>pascal<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<ul>\n<li><strong><span>1 pascal 1 N \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0= 1 kg \/ (ms\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0)<\/span><\/strong><\/li>\n<\/ul>\n<p><span>Pascal \u00e9 definido como um newton por metro quadrado.\u00a0No 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>A unidade de medida denominada\u00a0<\/span><strong><span>atmosfera padr\u00e3o<\/span><\/strong><span>\u00a0(\u00a0<\/span><strong><span>atm<\/span><\/strong><span>\u00a0) \u00e9 definida como:<\/span><\/p>\n<ul>\n<li><strong><span>1 atm = 101,33 kPa<\/span><\/strong><\/li>\n<\/ul>\n<p><span>A atmosfera padr\u00e3o aproxima-se da press\u00e3o m\u00e9dia ao n\u00edvel do mar na latitude de 45 \u00b0 N. Observe que h\u00e1 uma diferen\u00e7a entre a\u00a0<\/span><strong><span>atmosfera padr\u00e3o<\/span><\/strong><span>\u00a0(atm) e a\u00a0<\/span><strong><span>atmosfera t\u00e9cnica<\/span><\/strong><span>\u00a0(em).<\/span><\/p>\n<p><span>Uma atmosfera t\u00e9cnica \u00e9 uma unidade de press\u00e3o n\u00e3o SI igual a um quilograma-for\u00e7a por cent\u00edmetro quadrado.<\/span><\/p>\n<ul>\n<li><strong><span>1 a = 98,67 kPa<\/span><\/strong><\/li>\n<\/ul>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Pressure-Units-pascal-bar-psi-atmosphere.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16280 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Pressure-Units-pascal-bar-psi-atmosphere.png\" alt=\"Tabela - Convers\u00e3o entre unidades de press\u00e3o - pascal, bar, psi, atmosfera\" width=\"659\" height=\"289\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Pressure-Units-pascal-bar-psi-atmosphere.png\" \/><\/a><\/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>Unidade de Press\u00e3o SI &#8211; Pascal &#8211; kg \/ m.s2 &#8211; N \/ m2. A unidade SI de press\u00e3o e estresse \u00e9 o pascal. Uma atmosfera t\u00e9cnica \u00e9 uma unidade de press\u00e3o n\u00e3o SI igual a um quilograma-for\u00e7a por cent\u00edmetro quadrado. Engenharia T\u00e9rmica O que \u00e9 press\u00e3o Press\u00e3o\u00a0\u00e9 uma medida da\u00a0for\u00e7a exercida\u00a0por unidade de \u00e1rea &#8230; <a title=\"O que \u00e9 unidade de press\u00e3o SI &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-unidade-de-pressao-si-definicao\/\" aria-label=\"More on O que \u00e9 unidade de press\u00e3o SI &#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 unidade de press\u00e3o SI - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Unidade de Press\u00e3o SI - Pascal - kg \/ m.s2 - N \/ m2. 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