{"id":137,"date":"2023-06-25T09:46:18","date_gmt":"2023-06-25T09:46:18","guid":{"rendered":"https:\/\/physigeek.com\/pt\/milimetro-de-mercurio\/"},"modified":"2023-06-25T09:46:18","modified_gmt":"2023-06-25T09:46:18","slug":"milimetro-de-mercurio","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/milimetro-de-mercurio\/","title":{"rendered":"Mil\u00edmetro de merc\u00fario"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 um mil\u00edmetro de merc\u00fario e quanto vale 1 mil\u00edmetro de merc\u00fario. Voc\u00ea tamb\u00e9m encontrar\u00e1 as equival\u00eancias entre o mil\u00edmetro de merc\u00fario e outras unidades e, al\u00e9m disso, poder\u00e1 converter as unidades de press\u00e3o com uma calculadora online. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-el-milimetro-de-mercurio\"><\/span> Qual \u00e9 o mil\u00edmetro de merc\u00fario?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> O <strong>mil\u00edmetro de merc\u00fario<\/strong> \u00e9 uma unidade de press\u00e3o. Um mil\u00edmetro de merc\u00fario refere-se \u00e0 press\u00e3o que um corpo recebe quando imerso em merc\u00fario a uma profundidade de um mil\u00edmetro. Portanto, um mil\u00edmetro de merc\u00fario \u00e9 igual a 133,322 Pa.<\/p>\n<p> O s\u00edmbolo do merc\u00fario \u00e9 Hg, ent\u00e3o o s\u00edmbolo do mil\u00edmetro de merc\u00fario \u00e9 mmHg.<\/p>\n<p> Tomando a densidade do merc\u00fario como 13.595,1 kg\/m <sup>3<\/sup> e a gravidade como 9,80665 m\/s <sup>2<\/sup> , voc\u00ea pode calcular facilmente a que um mil\u00edmetro de merc\u00fario \u00e9 equivalente aplicando a f\u00f3rmula para a press\u00e3o em um fluido:<\/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-fced33095d22fd26e6c15b29f37063c6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{aligned}P&amp;=\\rho \\cdot g \\cdot h\\\\[2ex] &amp;=13595.1\\cdot 9.80665\\cdot 0.001\\\\[2ex] &amp; = 133.322 \\ Pa\\end{aligned }[\/latex ] Gardez \u00e0 l'esprit que le millim\u00e8tre de mercure est en r\u00e9alit\u00e9 une unit\u00e9 qui n'appartient pas au Syst\u00e8me international d'unit\u00e9s (SI). Cependant, dans certains domaines, cette mesure de pression est fr\u00e9quemment utilis\u00e9e, comme en m\u00e9decine. D'un autre c\u00f4t\u00e9, l'unit\u00e9 de pression dans le syst\u00e8me international est le pascal. Par cons\u00e9quent, en physique et en ing\u00e9nierie, la plupart des calculs de pression sont exprim\u00e9s en pascals. Enfin, il convient de noter que c'est une erreur tr\u00e8s courante de consid\u00e9rer qu'un millim\u00e8tre de mercure \u00e9quivaut \u00e0 un torr, mais ce n'est pas exactement le cas. Ci-dessous, nous verrons la diff\u00e9rence entre ces deux unit\u00e9s de pression. <span style=&quot;color:#4fd12f&quot;>\u27a4<\/span> <u style=&quot;text-decoration-color:#4fd12f;&quot;>Vous pouvez utiliser le calculateur en ligne ci-dessous pour convertir entre diff\u00e9rentes unit\u00e9s de pression.<\/u> <\/p>\n<h2 class=&quot;wp-block-heading&quot;><span class=&quot;ez-toc-section&quot; id=&quot;Equivalencias-del-milimetro-de-mercurio&quot;><\/span> \u00c9quivalences du millim\u00e8tre de mercure<span class=&quot;ez-toc-section-end&quot;><\/span><\/h2>\n<p> Dans la section pr\u00e9c\u00e9dente, nous avons vu la d\u00e9finition d&#8217;un millim\u00e8tre de mercure comme unit\u00e9 de pression. Ci-dessous un tableau avec les valeurs des \u00e9quivalences entre un millim\u00e8tre de mercure et d&#8217;autres mesures de pression diff\u00e9rentes.<\/p>\n<figure class=&quot;wp-block-table is-style-stripes&quot;>\n<table>\n<thead>\n<tr>\n<th> Unit\u00e9<\/th>\n<th class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> Abr\u00e9viation<\/th>\n<th> Equivalence \u00e0 1 mmHg<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Pascal<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> Pennsylvanie<\/td>\n<td> 133 322 Pa.<\/td>\n<\/tr>\n<tr>\n<td> Bar<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> bar<\/td>\n<td> 0,00133322 bars<\/td>\n<\/tr>\n<tr>\n<td> Baria<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> baria<\/td>\n<td> 1333,22 barres<\/td>\n<\/tr>\n<tr>\n<td> Atmosph\u00e8re technique<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> \u00e0<\/td>\n<td> 0,0013595 \u00e0<\/td>\n<\/tr>\n<tr>\n<td> Atmosph\u00e8re<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> au m<\/td>\n<td> 0,0013158 guichet automatique<\/td>\n<\/tr>\n<tr>\n<td> Torr<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> Torr<\/td>\n<td> 1 Torr (environ)<\/td>\n<\/tr>\n<tr>\n<td> Livre-force par pouce carr\u00e9<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> psi<\/td>\n<td> 0,0019337psi<\/td>\n<\/tr>\n<tr>\n<td> m\u00e8tres de colonne d&#8217;eau<\/td>\n<td class=&quot;has-text-align-center&quot; data-align=&quot;center&quot;> mca<\/td>\n<td> 0,0136 mca <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=&quot;wp-block-heading&quot;><span class=&quot;ez-toc-section&quot; id=&quot;Calculadora-para-convertir-unidades-de-presion&quot;><\/span> Calculatrice pour convertir les unit\u00e9s de pression<span class=&quot;ez-toc-section-end&quot;><\/span><\/h2>\n<p> Vous pouvez utiliser le convertisseur suivant pour convertir la valeur d&#8217;une pression exprim\u00e9e dans certaines unit\u00e9s vers d&#8217;autres unit\u00e9s diff\u00e9rentes. Il vous suffit de saisir la valeur de la pression, les unit\u00e9s de conversion et le nombre de d\u00e9cimales souhait\u00e9. Vous devez utiliser le point comme s\u00e9parateur d\u00e9cimal, par exemple 17,53. <\/p>\n<form action=&quot;&quot; method=&quot;post&quot;>\n<div align=&quot;center&quot; style=&quot;line-height:50px; background:#FEF9E7; padding:15px; border:2px solid #4FD12F; border-radius:15px; margin-bottom:20px&quot;><input name=&quot;datos&quot; style=&quot;border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; width: 100px&quot; placeholder=&quot;1&quot; required=&quot;&quot; oninvalid=&quot;this.setCustomValidity('Introduce el valor de la presi\u00f3n aqu\u00ed')&quot; oninput=&quot;this.setCustomValidity('')&quot;><select name=&quot;unidad1&quot; style=&quot;border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; width: 130px&quot;><option value=&quot;mmHg1&quot;> Millim\u00e8tre de mercure (mmHg)<\/option><option value=&quot;pascal1&quot;> Pascal (Pa)<\/option><option value=&quot;bar1&quot;> bar<\/option><option value=&quot;baria1&quot;> Baria (baria)<\/option><option value=&quot;attec1&quot;> Ambiance technique (\u00e0)<\/option><option value=&quot;atm1&quot;> Atmosph\u00e8re (atmosph\u00e8re)<\/option><option value=&quot;torr1&quot;> Torr (Torr)<\/option><option value=&quot;psi1&quot;> Livre-force par pouce carr\u00e9 (PSI)<\/option><option value=&quot;mca1&quot;> M\u00e8tres de colonne d&#8217;eau (mca)<\/option><\/select> <span style=&quot;color:#4FD12F&quot;>\u279c<\/span> <select name=&quot;unidad2&quot; style=&quot;border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; width: 130px&quot;><option value=&quot;pascal2&quot;> Pascal (Pa)<\/option><option value=&quot;bar2&quot;> bar<\/option><option value=&quot;baria2&quot;> Baria (baria)<\/option><option value=&quot;attec2&quot;> Ambiance technique (\u00e0)<\/option><option value=&quot;atm2&quot;> Atmosph\u00e8re (atmosph\u00e8re)<\/option><option value=&quot;torr2&quot;> Torr (Torr)<\/option><option value=&quot;mmHg2&quot;> Millim\u00e8tre de mercure (mmHg)<\/option><option value=&quot;psi2&quot;> Livre-force par pouce carr\u00e9 (PSI)<\/option><option value=&quot;mca2&quot;> M\u00e8tres de colonne d&#8217;eau (mca) <\/option><\/select><select name=&quot;decimales&quot; style=&quot;border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; width: 130px&quot;><option value=&quot;0decimales&quot;> 0 d\u00e9cimales<\/option><option value=&quot;1decimales&quot;> 1 d\u00e9cimale<\/option><option value=&quot;2decimales&quot;> 2 d\u00e9cimales<\/option><option value=&quot;3decimales&quot;> 3 d\u00e9cimales<\/option><option value=&quot;4decimales&quot;> 4 d\u00e9cimales<\/option><option value=&quot;5decimales&quot;> 5 d\u00e9cimales<\/option><option value=&quot;6decimales&quot;> 6 d\u00e9cimales<\/option><option value=&quot;7decimales&quot;> 7 d\u00e9cimales<\/option><option value=&quot;8decimales&quot;> 8 d\u00e9cimales<\/option><option value=&quot;9decimales&quot;> 9 d\u00e9cimales<\/option><option value=&quot;10decimales&quot;> 10 d\u00e9cimales <\/option><\/select><\/p>\n<div style=&quot;text-align:center&quot;><input align=&quot;center&quot; style=&quot;font-size:105%; border-radius:30px; margin-top: 20px; margin-bottom:15px&quot; type=&quot;submit&quot; name=&quot;submit&quot; value=&quot;Convertir&quot;><\/div>\n<\/div>\n<\/form>\n<h2 class=&quot;wp-block-heading&quot;><span class=&quot;ez-toc-section&quot; id=&quot;Diferencia-entre-el-milimetro-de-mercurio-y-el-torr&quot;><\/span> Diff\u00e9rence entre millim\u00e8tre de mercure et torr<span class=&quot;ez-toc-section-end&quot;><\/span><\/h2>\n<p> Le millim\u00e8tre de mercure et le torr sont deux unit\u00e9s de pression. Bien qu&#8217;au d\u00e9but les deux unit\u00e9s \u00e9taient consid\u00e9r\u00e9es comme \u00e9quivalentes, actuellement <strong>la diff\u00e9rence entre la valeur du millim\u00e8tre de mercure et la valeur du torr est de 0,0000143 %.<\/strong> La raison de cette diff\u00e9rence est expliqu\u00e9e ci-dessous. \u00c0 l&#8217;origine, le torr \u00e9tait d\u00e9fini comme une unit\u00e9 de pression exactement \u00e9gale \u00e0 la pression exerc\u00e9e par un millim\u00e8tre de mercure \u00e0 0\u00baC. Cependant, cette description n&#8217;\u00e9tait pas assez rigoureuse puisque la gravit\u00e9 change l\u00e9g\u00e8rement en fonction de la position de la Terre (du fait qu&#8217;elle n&#8217;est pas compl\u00e8tement sph\u00e9rique et du fait de sa rotation). Ainsi, en 1954, lors de la 10e Conf\u00e9rence g\u00e9n\u00e9rale des poids et mesures, le torr fut red\u00e9fini. Depuis, le torr est \u00e9gal \u00e0 1\/760 de la pression atmosph\u00e9rique normale, soit 133,322368421 pascals. [latex]1 \\ Torr = 133,322368421 \\ Pa &#8221; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;766&#8243; width=&#8221;807&#8243; style=&#8221;vertical-align: 0px;&#8221;><\/p>\n<\/p>\n<p> Por outro lado, um mil\u00edmetro de merc\u00fario (mmHg) equivale exatamente a 133,322387415 Pa.<\/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-303ab3dc6c1d6fb97e85999ee08d1488_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1 \\ mmHg = 133,322387415 \\ Pa \" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"237\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Resumindo, o mil\u00edmetro de merc\u00fario e o torr n\u00e3o s\u00e3o exatamente iguais, mas sim seus valores s\u00e3o ligeiramente diferentes. Por\u00e9m, como seus valores s\u00e3o muito semelhantes e historicamente id\u00eanticos, geralmente s\u00e3o considerados a mesma unidade. Como voc\u00ea pode ver abaixo, o erro cometido ao assumir a igualdade entre essas duas medidas de press\u00e3o \u00e9 praticamente zero:<\/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-cb878c0e6d86c7bc56c4eae10597ad72_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1 \\ mmHg = 1,000000142466321 \\ Torr \" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"287\" 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-835cda73f01fe3bb1d3e6b752c45a2e2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1 \\ Torr = 0,999999857533699 \\ mmHg \" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"288\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Historia-del-milimetro-de-mercurio\"><\/span> Hist\u00f3ria do mil\u00edmetro de merc\u00fario<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A origem do mil\u00edmetro de merc\u00fario como unidade de press\u00e3o est\u00e1 na cria\u00e7\u00e3o do bar\u00f4metro de merc\u00fario, inventado pelo f\u00edsico Evangelista Torricelli em 1643.<\/p>\n<p> Este instrumento consistia em mergulhar um tubo contendo merc\u00fario selado em uma extremidade em um recipiente aberto tamb\u00e9m cheio de merc\u00fario. Assim, o merc\u00fario no interior do tubo aumentava ou diminu\u00eda dependendo da press\u00e3o que o ar exercia sobre o l\u00edquido do recipiente aberto, ou seja, de acordo com a press\u00e3o atmosf\u00e9rica. Desta forma, a press\u00e3o do ambiente poderia ser medida com base nos mil\u00edmetros de merc\u00fario deslocados.<\/p>\n<p> Por\u00e9m, a densidade do merc\u00fario depende da temperatura e por outro lado a gravidade tamb\u00e9m varia ligeiramente dependendo da localiza\u00e7\u00e3o. O que significava que a equival\u00eancia de um mil\u00edmetro de merc\u00fario a outra unidade de press\u00e3o mudava dependendo desses dois fatores.<\/p>\n<p> Portanto, decidiu-se definir o mil\u00edmetro de merc\u00fario como a press\u00e3o exercida na base de uma coluna de merc\u00fario com um mil\u00edmetro de altura, \u00e0 temperatura de 0 \u00baC, na qual a densidade do merc\u00fario \u00e9 13.595,1 kg\/m <sup>3<\/sup> , e com gravidade de 9,80665 m\/s <sup>2<\/sup> . Assim, o valor de 1 mil\u00edmetro de merc\u00fario equivale \u00e0 seguinte express\u00e3o:<\/p>\n<p class=\"has-text-align-center\"> [l\u00e1tex]\\begin{aligned}P&amp;=\\rho \\cdot g \\cdot h\\\\[2ex] &amp;=13595.1\\cdot 9.80665\\cdot 0.001\\\\[2ex] &amp; = 133.322 \\Pa\\end{aligned }[\/latex ]<\/p>\n<p> Desta forma, o mil\u00edmetro de merc\u00fario \u00e9 definido numericamente e assume sempre o mesmo valor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 um mil\u00edmetro de merc\u00fario e quanto vale 1 mil\u00edmetro de merc\u00fario. Voc\u00ea tamb\u00e9m encontrar\u00e1 as equival\u00eancias entre o mil\u00edmetro de merc\u00fario e outras unidades e, al\u00e9m disso, poder\u00e1 converter as unidades de press\u00e3o com uma calculadora online. Qual \u00e9 o mil\u00edmetro de merc\u00fario? O mil\u00edmetro de merc\u00fario \u00e9 uma &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/milimetro-de-mercurio\/\"> <span class=\"screen-reader-text\">Mil\u00edmetro de merc\u00fario<\/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-137","post","type-post","status-publish","format-standard","hentry","category-unidades"],"yoast_head":"<!-- This site is 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