{"id":257,"date":"2023-06-23T04:44:04","date_gmt":"2023-06-23T04:44:04","guid":{"rendered":"https:\/\/physigeek.com\/pt\/absorvancia\/"},"modified":"2023-06-23T04:44:04","modified_gmt":"2023-06-23T04:44:04","slug":"absorvancia","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/absorvancia\/","title":{"rendered":"Absorv\u00e2ncia"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 absorb\u00e2ncia em f\u00edsica, como a absorb\u00e2ncia \u00e9 calculada e, finalmente, qual \u00e9 a diferen\u00e7a entre absorb\u00e2ncia e transmit\u00e2ncia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-absorbancia\"><\/span> O que \u00e9 absorb\u00e2ncia?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Na f\u00edsica, <strong>a absorb\u00e2ncia<\/strong> \u00e9 uma medida que indica a atenua\u00e7\u00e3o da radia\u00e7\u00e3o \u00e0 medida que ela passa por uma subst\u00e2ncia. Em outras palavras, a absorb\u00e2ncia \u00e9 uma quantidade usada para comparar a quantidade de luz que atinge uma subst\u00e2ncia com a quantidade de luz que passa por ela depois de passar por ela.<\/p>\n<p> Matematicamente, a absorb\u00e2ncia \u00e9 definida como menos o logaritmo do quociente entre a intensidade da luz que passa por uma subst\u00e2ncia e a intensidade da luz antes de entrar em contato com essa subst\u00e2ncia. Abaixo voc\u00ea pode ver a f\u00f3rmula para esta medida f\u00edsica.<\/p>\n<p> A absorv\u00e2ncia \u00e9 frequentemente usada para quantificar os resultados de um experimento. Assim, o uso da absorb\u00e2ncia \u00e9 comum em laborat\u00f3rios de qu\u00edmica.<\/p>\n<p> \u00c0s vezes, em vez de absorb\u00e2ncia, dizemos <strong>absorb\u00e2ncia<\/strong> , porque seria normal que o termo derivasse do verbo <em>absorver<\/em> . Por\u00e9m, \u00e9 muito mais comum dizer absorb\u00e2ncia, j\u00e1 que a palavra vem da espanholiza\u00e7\u00e3o do termo ingl\u00eas <em>absorb\u00e2ncia<\/em> .<\/p>\n<p> Por fim, o significado de absorb\u00e2ncia n\u00e3o deve ser confundido com o conceito de <strong>densidade \u00f3ptica<\/strong> , que consiste na absorb\u00e2ncia por unidade de comprimento.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-la-absorbancia\"><\/span>f\u00f3rmula de absor\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A absorv\u00e2ncia \u00e9 igual a menos o logaritmo do quociente entre a intensidade da luz que sai e a intensidade da luz que entra. A <strong>f\u00f3rmula de absorb\u00e2ncia<\/strong> \u00e9, portanto, 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-4e4684aa45bb107a5d8d2394c502761c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle A=-\\log\\frac{I_1}{I_0}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"97\" 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-816b613a4f79d4bf9cb51396a9654120_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"A\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"13\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a absorv\u00e2ncia, ou seja, a quantidade de luz absorvida. <\/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> A express\u00e3o anterior vem da <a href=\"https:\/\/physigeek.com\/pt\/lei-lambert-da-cerveja\/\">lei de Beer-Lambert<\/a> , da qual tamb\u00e9m podemos deduzir a seguinte f\u00f3rmula para calcular a absorb\u00e2ncia:<\/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-28378e5d8fcc20ed10cbda44ec3a0add_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"A=\\varepsilon\\cdot\\ell \\cdot c\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"86\" style=\"vertical-align: 0px;\"><\/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-816b613a4f79d4bf9cb51396a9654120_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"A\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"13\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a absorv\u00e2ncia. <\/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-43ad9834133cf0cf160ceb6f8c4b6c2b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\varepsilon\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a absortividade molar, que \u00e9 uma constante de proporcionalidade. <\/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-a01f1555785d2234d4294020a2e3968a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\ell\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o comprimento percorrido pela luz no meio.<\/span><\/li>\n<li><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-276a76eafbebc4494deafceec7cc4ddd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"c\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a concentra\u00e7\u00e3o da subst\u00e2ncia que absorve luz.<\/span><\/li>\n<\/ul>\n<p> Portanto, quanto maior for a concentra\u00e7\u00e3o da amostra, maior ser\u00e1 a absorv\u00e2ncia, o que significa que mais luz a subst\u00e2ncia na amostra ir\u00e1 absorver. Da mesma forma, quanto mais longo for o meio atravessado pela radia\u00e7\u00e3o eletromagn\u00e9tica, maior ser\u00e1 o valor de absorb\u00e2ncia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Absorbancia-y-transmitancia\"><\/span> Absor\u00e7\u00e3o e transmiss\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Nesta se\u00e7\u00e3o final veremos a diferen\u00e7a entre absorb\u00e2ncia e transmiss\u00e3o, pois s\u00e3o dois conceitos f\u00edsicos intimamente relacionados.<\/p>\n<p> <strong>A transmit\u00e2ncia<\/strong> \u00e9 uma quantidade f\u00edsica que expressa a quantidade de energia luminosa transmitida pela radia\u00e7\u00e3o eletromagn\u00e9tica.<\/p>\n<p> Portanto, a <strong>diferen\u00e7a entre absorv\u00e2ncia e transmit\u00e2ncia<\/strong> \u00e9 que a absorv\u00e2ncia mede a quantidade de luz que uma subst\u00e2ncia absorve, enquanto a transmit\u00e2ncia mede a quantidade de luz que passa atrav\u00e9s de uma subst\u00e2ncia.<\/p>\n<p> A absorv\u00e2ncia e a transmiss\u00e3o est\u00e3o, portanto, ligadas. Na verdade, se o valor de uma quantidade for conhecido, o valor da outra quantidade pode ser determinado. Voc\u00ea pode ver como isso \u00e9 feito 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\/transmitancia\/\">O que \u00e9 transmiss\u00e3o?<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 absorb\u00e2ncia em f\u00edsica, como a absorb\u00e2ncia \u00e9 calculada e, finalmente, qual \u00e9 a diferen\u00e7a entre absorb\u00e2ncia e transmit\u00e2ncia. O que \u00e9 absorb\u00e2ncia? Na f\u00edsica, a absorb\u00e2ncia \u00e9 uma medida que indica a atenua\u00e7\u00e3o da radia\u00e7\u00e3o \u00e0 medida que ela passa por uma subst\u00e2ncia. Em outras palavras, a absorb\u00e2ncia \u00e9 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/absorvancia\/\"> <span class=\"screen-reader-text\">Absorv\u00e2ncia<\/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-257","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 absorb\u00e2ncia? 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