{"id":75,"date":"2023-06-26T09:51:45","date_gmt":"2023-06-26T09:51:45","guid":{"rendered":"https:\/\/physigeek.com\/pt\/unidade-bar-de-pressao\/"},"modified":"2023-06-26T09:51:45","modified_gmt":"2023-06-26T09:51:45","slug":"unidade-bar-de-pressao","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/unidade-bar-de-pressao\/","title":{"rendered":"Barra (unidade de press\u00e3o)"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 uma barra como unidade de press\u00e3o. Voc\u00ea encontrar\u00e1 uma tabela de equival\u00eancias entre as diferentes unidades de press\u00e3o e finalmente em quais \u00e1reas esta medi\u00e7\u00e3o de press\u00e3o \u00e9 utilizada. <\/p>\n<h2 class=\"wp-block-heading\" id=\"que-es-un-bar-unidad-de-presion\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-un-bar-unidad-de-presion\"><\/span> O que \u00e9 uma barra (unidade de press\u00e3o)?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A barra \u00e9 uma unidade de press\u00e3o<\/strong> , ou seja, a barra \u00e9 uma unidade com a qual os valores de press\u00e3o podem ser expressos. Concretamente, uma barra equivale a 100.000 Pa.<\/p>\n<p> Uma barra corresponde, portanto, aproximadamente \u00e0 press\u00e3o exercida na Terra ao n\u00edvel do mar (1,013 bar).<\/p>\n<p> Da mesma forma, a barra n\u00e3o \u00e9 a unidade de press\u00e3o do Sistema Internacional de Unidades (SI), pois \u00e9 o pascal. Assim, em f\u00edsica, a maioria das press\u00f5es \u00e9 expressa em pascal, embora a unidade bar tamb\u00e9m seja amplamente utilizada.<\/p>\n<p> Por isso a barra \u00e9 definida de acordo com o pascal, por ser a unidade do Sistema Internacional. Em particular, uma barra equivale a cem mil pascais.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-026e520684e5d2bcc63ab755255ea51b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1 \\ bar = 100 000 \\ Pa\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"145\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Como voc\u00ea pode ver, o s\u00edmbolo para expressar a press\u00e3o em bares \u00e9 a pr\u00f3pria palavra bar.<\/p>\n<p> Deve-se levar em considera\u00e7\u00e3o que press\u00e3o absoluta n\u00e3o \u00e9 igual a press\u00e3o relativa (ou press\u00e3o manom\u00e9trica), pois press\u00e3o relativa \u00e9 a diferen\u00e7a entre a press\u00e3o absoluta e a press\u00e3o atmosf\u00e9rica. Assim, para diferenciar estes dois tipos de press\u00e3o, geralmente \u00e9 colocada uma letra ap\u00f3s o s\u00edmbolo da barra: o \u201ca\u201d corresponde \u00e0 press\u00e3o absoluta e, por outro lado, o \u201cg\u201d indica que se trata de uma press\u00e3o relativa.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-4cce470953f5655d49345892f9a55176_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Pression absolue} \\ \\color{orange}\\bm{\\longrightarrow}\\color{black} \\ 10\\ bar \\ a\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"327\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-9120e0751c038276bbabc1f0158da854_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\text{Pression relative} \\ \\color{orange}\\bm{\\longrightarrow}\\color{black} \\ 10\\ bar \\ g\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"327\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\" id=\"tabla-de-equivalencias-de-un-bar\"><span class=\"ez-toc-section\" id=\"Tabla-de-equivalencias-de-un-bar\"><\/span> Tabela de equival\u00eancias de uma barra<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Agora que sabemos o que significa a barra como unidade de press\u00e3o, abaixo voc\u00ea encontrar\u00e1 uma tabela com os valores das equival\u00eancias entre uma barra e outras diferentes unidades de press\u00e3o.<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Unidade<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Abrevia\u00e7\u00e3o<\/th>\n<th> Equival\u00eancia a 1 barra<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Pascal<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> Da<\/td>\n<td> 100.000Pa<\/td>\n<\/tr>\n<tr>\n<td> Baria<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> b\u00e1ria<\/td>\n<td> 1 milh\u00e3o de barras<\/td>\n<\/tr>\n<tr>\n<td> Atmosfera t\u00e9cnica<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> tem<\/td>\n<td> 1,01972 TB<\/td>\n<\/tr>\n<tr>\n<td> Atmosfera<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> em M<\/td>\n<td> 0,98692 caixas eletr\u00f4nicos<\/td>\n<\/tr>\n<tr>\n<td> Torr<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> torr<\/td>\n<td> 750,06 torr<\/td>\n<\/tr>\n<tr>\n<td> Libra for\u00e7a por polegada quadrada<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> psi<\/td>\n<td> 14,50377 psi<\/td>\n<\/tr>\n<tr>\n<td> metros de coluna de \u00e1gua<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> mca<\/td>\n<td> 10h20 MCA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p> Se estiver mais interessado, voc\u00ea pode ver as equival\u00eancias entre as diferentes unidades de press\u00e3o no seguinte link: <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 10px; padding-left: 20px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/physigeek.com\/pt\/unidades-de-pressao\/\">tabela de unidades de press\u00e3o<\/a><\/div>\n<p> Voc\u00ea pode usar esses valores para converter a press\u00e3o expressa em certas unidades de press\u00e3o em outras unidades.<\/p>\n<p> Caso queira <strong>converter unidades expressas em bares para outra medida de press\u00e3o<\/strong> , basta multiplicar o valor da press\u00e3o pela equival\u00eancia entre as duas unidades.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-c10d94a10bb73dfd73fee2f5fc92e55d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" 5 \\ bar \\ \\color{orange}\\bm{\\longrightarrow}\\color{black} \\ Pa \\ ?\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"212\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-028f748cc4cd1338819de334df8099f5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" 5 \\cdot 100000 =500000 \\Pa\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"152\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Por outro lado, se quiser <strong>converter outras unidades de press\u00e3o em bares<\/strong> , deve-se dividir o valor da press\u00e3o pela equival\u00eancia indicada na tabela.<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-2bd29fde32d5c09e7ae3c5d9c01ad2ab_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" 4 \\ atm \\ \\color{orange}\\bm{\\longrightarrow}\\color{noir} \\ bar \\ ?\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"214\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-2e3c1072a3f95f7753136fe84ac20e9c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\cfrac{4}{0,98692}= 4,053 \\ bar \" title=\"Rendered by QuickLaTeX.com\" height=\"42\" width=\"159\" style=\"vertical-align: -16px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\" id=\"usos-del-bar\"><span class=\"ez-toc-section\" id=\"Usos-del-bar\"><\/span> usos de barra<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Dada a defini\u00e7\u00e3o da barra como unidade de press\u00e3o, nesta se\u00e7\u00e3o veremos as aplica\u00e7\u00f5es desta medi\u00e7\u00e3o de press\u00e3o.<\/p>\n<p> O principal uso da barra \u00e9 em meteorologia, mas neste caso as press\u00f5es s\u00e3o geralmente dadas em milibares. Lembre-se de que o prefixo mili indica um mil\u00e9simo, ent\u00e3o um milibar \u00e9 igual a um mil\u00e9simo de uma barra.<\/p>\n<p> Por outro lado, na engenharia as press\u00f5es s\u00e3o frequentemente expressas em bares, pois trabalhamos com press\u00f5es muito elevadas e, portanto, \u00e9 mais pr\u00e1tico escrever o valor de uma press\u00e3o em bares para reduzir os n\u00fameros de tamanho.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 uma barra como unidade de press\u00e3o. Voc\u00ea encontrar\u00e1 uma tabela de equival\u00eancias entre as diferentes unidades de press\u00e3o e finalmente em quais \u00e1reas esta medi\u00e7\u00e3o de press\u00e3o \u00e9 utilizada. O que \u00e9 uma barra (unidade de press\u00e3o)? A barra \u00e9 uma unidade de press\u00e3o , ou seja, a barra &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/unidade-bar-de-pressao\/\"> <span class=\"screen-reader-text\">Barra (unidade de press\u00e3o)<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[16],"tags":[],"class_list":["post-75","post","type-post","status-publish","format-standard","hentry","category-unidades"],"yoast_head":"<!-- This site is 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