{"id":269,"date":"2023-06-22T22:34:47","date_gmt":"2023-06-22T22:34:47","guid":{"rendered":"https:\/\/physigeek.com\/pt\/transmitancia\/"},"modified":"2023-06-22T22:34:47","modified_gmt":"2023-06-22T22:34:47","slug":"transmitancia","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/transmitancia\/","title":{"rendered":"Transmiss\u00e3o"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 transmiss\u00e3o na f\u00edsica. Voc\u00ea descobrir\u00e1, portanto, o significado da transmiss\u00e3o, como a transmiss\u00e3o \u00e9 calculada e qual a diferen\u00e7a entre o conceito de transmiss\u00e3o e absorv\u00e2ncia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-transmitancia\"><\/span>O que \u00e9 transmiss\u00e3o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Na f\u00edsica, <strong>transmit\u00e2ncia<\/strong> (ou <strong>transmit\u00e2ncia<\/strong> ) \u00e9 uma medida que indica a quantidade de energia que passa por um corpo durante um determinado per\u00edodo de tempo. Ou seja, transmiss\u00e3o \u00e9 uma grandeza f\u00edsica que serve para expressar a energia que n\u00e3o \u00e9 absorvida por um corpo, mas que passa por ele.<\/p>\n<p> Geralmente, quando falamos em transmiss\u00e3o, estamos nos referindo \u00e0 <strong>transmiss\u00e3o \u00f3ptica<\/strong> , que \u00e9 a quantidade de energia luminosa que passa por um corpo. Mas tamb\u00e9m existe <strong>a transmiss\u00e3o t\u00e9rmica<\/strong> , que \u00e9 a energia t\u00e9rmica que passa por um corpo. Veremos mais diferen\u00e7as entre esses dois tipos de transmiss\u00e3o a seguir.<\/p>\n<p> A transmit\u00e2ncia \u00e9 uma quantidade comumente usada para analisar os resultados de um experimento cient\u00edfico. A transmiss\u00e3o \u00e9, portanto, uma propriedade f\u00edsica comumente usada em laborat\u00f3rios qu\u00edmicos. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-la-transmitancia\"><\/span> F\u00f3rmula de transmiss\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A transmiss\u00e3o \u00e9 igual \u00e0 quantidade de luz que passa pela amostra que est\u00e1 sendo analisada dividida pela quantidade de luz que incide sobre a amostra.<\/p>\n<p> A <strong>f\u00f3rmula para transmiss\u00e3o \u00f3ptica<\/strong> \u00e9, portanto:<\/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-7f2198be75f7105b3ea5d6559d07b196_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle T=\\frac{I_1}{I_0}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"54\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-7e093fd43ad2c244140c11afe4d4bdff_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"T\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a transmiss\u00e3o, ou seja, a quantidade de luz que passa pela amostra. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-4e71d6c87c1a3adae26de81b7ac822db_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"I_1\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"14\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a intensidade da luz de sa\u00edda. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-a388cb824462284238cced83860611ce_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"I_0\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"15\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a intensidade da luz que entra.<\/span><\/li>\n<\/ul>\n<p> Muitas vezes, a transmiss\u00e3o \u00e9 expressa em percentagem, caso em que a express\u00e3o deve ser multiplicada por cem: <\/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-c4ea78173630f3b488058de1c20e931f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle T(\\% )=\\frac{I_1}{I_0}\\cdot 100\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"124\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Transmitancia-y-absorbancia\"><\/span> Transmiss\u00e3o e absor\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Nesta se\u00e7\u00e3o veremos como a transmiss\u00e3o difere da absorb\u00e2ncia e qual \u00e9 a rela\u00e7\u00e3o entre esses dois conceitos f\u00edsicos.<\/p>\n<p> Em f\u00edsica, <strong>absorb\u00e2ncia<\/strong> \u00e9 a quantidade de energia luminosa que uma amostra absorve quando um feixe de luz passa por ela.<\/p>\n<p> Portanto, a <strong>diferen\u00e7a entre transmit\u00e2ncia e absorv\u00e2ncia<\/strong> \u00e9 se a luz absorvida ou a luz que sai \u00e9 analisada. Transmit\u00e2ncia \u00e9 a quantidade de luz que passa atrav\u00e9s de uma amostra, enquanto absorv\u00e2ncia \u00e9 a quantidade de luz que uma amostra absorve.<\/p>\n<p> Al\u00e9m disso, a transmit\u00e2ncia e a absorb\u00e2ncia est\u00e3o matematicamente relacionadas pela <a href=\"https:\/\/physigeek.com\/pt\/lei-lambert-da-cerveja\/\">lei de Beer<\/a> , uma vez que a absorb\u00e2ncia \u00e9 igual a menos o logaritmo da transmit\u00e2ncia na base dez.<\/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-a1922e746df8e667b9a5edda5c8b7bbd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"A=-\\log (T)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"102\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Para saber mais sobre absorb\u00e2ncia, voc\u00ea pode ler nosso artigo sobre absorb\u00e2ncia clicando aqui: <\/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\/absorvancia\/\">O que \u00e9 absorb\u00e2ncia?<\/a><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Transmitancia-termica\"><\/span> Transmiss\u00e3o t\u00e9rmica<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A transmit\u00e2ncia t\u00e9rmica<\/strong> \u00e9 a energia t\u00e9rmica que passa atrav\u00e9s de uma subst\u00e2ncia por unidade de \u00e1rea. Assim, a transmiss\u00e3o t\u00e9rmica \u00e9 o inverso da resist\u00eancia t\u00e9rmica.<\/p>\n<p> A <strong>f\u00f3rmula para calcular o coeficiente de transmiss\u00e3o t\u00e9rmica<\/strong> \u00e9 a seguinte:<\/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-b666b3cc76c6d9d5f909a026c7c755a5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle U=\\frac{1}{R_t}=\\frac{W}{S\\cdot K}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"127\" style=\"vertical-align: -15px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-a9cba92437b396a60e4bfd0abc81355f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"U\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o coeficiente de transmiss\u00e3o t\u00e9rmica <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-e14c08fd76cb79c4ad180bda04a4b135_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"R_t\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"18\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a resist\u00eancia t\u00e9rmica. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-183777ab9133546b80b6f342c6ec9919_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"W\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"19\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a pot\u00eancia gerada pela energia t\u00e9rmica. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-52fd2a0fc27878e7dfce68d4632b4ffb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"S\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a superf\u00edcie que transfere energia t\u00e9rmica. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-7fb8d8d37cb2b48aee9e97aee7728d8f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"K\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a diferen\u00e7a de temperatura.<\/span><\/li>\n<\/ul>\n<p> Na engenharia, a transmit\u00e2ncia t\u00e9rmica \u00e9 amplamente utilizada na constru\u00e7\u00e3o, principalmente em projetos de aquecimento, pois permite calcular o isolamento t\u00e9rmico e as perdas de energia.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 transmiss\u00e3o na f\u00edsica. Voc\u00ea descobrir\u00e1, portanto, o significado da transmiss\u00e3o, como a transmiss\u00e3o \u00e9 calculada e qual a diferen\u00e7a entre o conceito de transmiss\u00e3o e absorv\u00e2ncia. O que \u00e9 transmiss\u00e3o? Na f\u00edsica, transmit\u00e2ncia (ou transmit\u00e2ncia ) \u00e9 uma medida que indica a quantidade de energia que passa por um &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/transmitancia\/\"> <span class=\"screen-reader-text\">Transmiss\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":[13],"tags":[],"class_list":["post-269","post","type-post","status-publish","format-standard","hentry","category-optico"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u25b7 O que \u00e9 transmiss\u00e3o? (F\u00f3rmula)<\/title>\n<meta name=\"description\" content=\"Aqui voc\u00ea descobrir\u00e1 o que \u00e9 transmit\u00e2ncia, como a transmit\u00e2ncia \u00e9 calculada (f\u00f3rmula) e qual a diferen\u00e7a entre transmit\u00e2ncia e absorb\u00e2ncia.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/physigeek.com\/pt\/transmitancia\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u25b7 O que \u00e9 transmiss\u00e3o? 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