{"id":48617,"date":"2019-11-11T08:21:34","date_gmt":"2019-11-11T07:21:34","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-forca-e-pressao-definicao\/"},"modified":"2020-01-29T17:09:45","modified_gmt":"2020-01-29T16:09:45","slug":"o-que-e-forca-e-pressao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-forca-e-pressao-definicao\/","title":{"rendered":"O que \u00e9 for\u00e7a e press\u00e3o &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Em geral, a press\u00e3o ou a for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia \u00e9 causada pelas colis\u00f5es das mol\u00e9culas da subst\u00e2ncia com os limites do sistema. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<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>O que \u00e9 press\u00e3o<\/h2>\n<p><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><strong>For\u00e7a e press\u00e3o<\/strong>\u00a0est\u00e3o intimamente relacionadas.\u00a0<strong><a title=\"O que \u00e9 press\u00e3o - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\">Press\u00e3o<\/a><\/strong>\u00a0\u00e9 uma medida da\u00a0<strong>for\u00e7a exercida<\/strong>\u00a0por unidade de \u00e1rea nos limites de uma subst\u00e2ncia.\u00a0A unidade padr\u00e3o de\u00a0<strong>press\u00e3o<\/strong>\u00a0no sistema SI \u00e9 o\u00a0<strong>Newton por metro quadrado ou pascal (Pa)<\/strong>\u00a0.\u00a0Matematicamente:<\/p>\n<p><strong>p = F \/ A<\/strong><\/p>\n<p>Onde<\/p>\n<ul>\n<li><strong>p \u00e9 a press\u00e3o<\/strong><\/li>\n<li><strong>F \u00e9 a for\u00e7a normal<\/strong><\/li>\n<li><strong>A \u00e9 a \u00e1rea do limite<\/strong><\/li>\n<\/ul>\n<p>Pascal \u00e9 definido como a for\u00e7a de 1N exercida na \u00e1rea da unidade.<\/p>\n<ul>\n<li><strong>1 Pascal = 1 N \/ m\u00a0<sup>2<\/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\">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<strong>kPa<\/strong>\u00a0, a\u00a0<strong>barra<\/strong>\u00a0e o\u00a0<strong>MPa<\/strong>\u00a0.<\/p>\n<ul>\n<li><strong>1 MPa 10\u00a0<sup>6<\/sup>\u00a0N \/ m\u00a0<sup>2<\/sup><\/strong><\/li>\n<li><strong>1 bar 10\u00a0<sup>5<\/sup>\u00a0N \/ m\u00a0<sup>2<\/sup><\/strong><\/li>\n<li><strong>1 kPa 10\u00a0<sup>3<\/sup>\u00a0N \/ m\u00a0<sup>2<\/sup><\/strong><\/li>\n<\/ul>\n<p>Em geral, a press\u00e3o ou a for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia \u00e9 causada pelas\u00a0<strong>colis\u00f5es<\/strong>\u00a0das\u00a0<strong>mol\u00e9culas<\/strong>\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<strong>press\u00e3o<\/strong>\u00a0exercida por um sistema em seu entorno.\u00a0A press\u00e3o como\u00a0<a title=\"Propriedades extensivas e intensivas\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/extensive-and-intensive-properties\/\"><strong>vari\u00e1vel intensiva<\/strong><\/a>\u00e9 constante em um sistema fechado.\u00a0Realmente s\u00f3 \u00e9 relevante em sistemas l\u00edquidos ou gasosos.<\/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>[snippet xyz-ihs = \u201dpress\u00e3o\u201d]<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div class=\"su-quote su-quote-style-default\">\n<div><\/div>\n<div><\/div>\n<div class=\"su-quote-inner su-clearfix\">&#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;.<\/div>\n<\/div>\n<div>\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>Em geral, a press\u00e3o ou a for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia \u00e9 causada pelas colis\u00f5es das mol\u00e9culas da subst\u00e2ncia com os limites do sistema. Engenharia T\u00e9rmica O que \u00e9 press\u00e3o For\u00e7a e press\u00e3o\u00a0est\u00e3o intimamente relacionadas.\u00a0Press\u00e3o\u00a0\u00e9 uma medida da\u00a0for\u00e7a exercida\u00a0por unidade de \u00e1rea nos limites de uma subst\u00e2ncia.\u00a0A unidade padr\u00e3o &#8230; <a title=\"O que \u00e9 for\u00e7a e press\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-forca-e-pressao-definicao\/\" aria-label=\"More on O que \u00e9 for\u00e7a e 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 for\u00e7a e press\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em geral, a press\u00e3o ou a for\u00e7a exercida por unidade de \u00e1rea nos limites de uma subst\u00e2ncia \u00e9 causada pelas colis\u00f5es das mol\u00e9culas da subst\u00e2ncia com os limites do sistema. 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