{"id":204,"date":"2023-06-24T05:16:20","date_gmt":"2023-06-24T05:16:20","guid":{"rendered":"https:\/\/physigeek.com\/pt\/temperatura-absoluta\/"},"modified":"2023-06-24T05:16:20","modified_gmt":"2023-06-24T05:16:20","slug":"temperatura-absoluta","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/temperatura-absoluta\/","title":{"rendered":"Temperatura absoluta"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 temperatura absoluta e o que \u00e9 uma escala de temperatura absoluta. Assim voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de ambos os termos, quais s\u00e3o as escalas de temperatura absoluta e relativa e como convert\u00ea-las. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-temperatura-absoluta\"><\/span> O que \u00e9 temperatura absoluta?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>Temperatura absoluta<\/strong> \u00e9 o valor da temperatura medida em rela\u00e7\u00e3o ao zero absoluto (0 K ou -273,15 \u00baC). Em outras palavras, a temperatura absoluta indica a temperatura de um corpo ou sistema tomando o zero absoluto como o valor zero da escala termom\u00e9trica.<\/p>\n<p> Portanto, uma <strong>escala de temperatura absoluta<\/strong> \u00e9 uma escala termom\u00e9trica que indica o valor medido por uma temperatura absoluta. Em outras palavras, o zero de uma escala de temperatura absoluta corresponde ao zero absoluto da temperatura.<\/p>\n<p> Geralmente, em termodin\u00e2mica, a temperatura absoluta \u00e9 usada nas f\u00f3rmulas. As temperaturas relativas s\u00e3o usadas apenas quando a f\u00f3rmula requer uma diferen\u00e7a de temperatura. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFCuales-son-las-escalas-de-temperatura-absoluta\"><\/span> Quais s\u00e3o as escalas de temperatura absoluta?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As principais <strong>escalas de temperatura absoluta<\/strong> s\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Escala Kelvin<\/strong> : escala termom\u00e9trica absoluta cuja unidade \u00e9 igual a um grau Celsius. Esta escala de temperatura \u00e9 a mais utilizada na ci\u00eancia.<\/span><\/li>\n<li> <span style=\"color:#101010;font-weight: normal;\"><strong>Escala Rankine<\/strong> : escala absoluta de temperatura cuja unidade equivale a um grau Fahrenheit, que \u00e9 a unidade de temperatura do sistema ingl\u00eas.<\/span><\/li>\n<\/ul>\n<p> Uma caracter\u00edstica das escalas de temperatura absoluta \u00e9 que todos os seus valores s\u00e3o positivos, pois o zero da escala equivale ao zero absoluto da temperatura.<\/p>\n<p> As duas escalas de temperatura absoluta s\u00e3o explicadas em detalhes abaixo.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Escala-kelvin\"><\/span> Escala Kelvin<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> O <strong>Kelvin<\/strong> , historicamente chamado <strong>de grau Kelvin<\/strong> , \u00e9 a unidade de temperatura do Sistema Internacional de Unidades (SI).<\/p>\n<p> Assim, a <strong>escala Kelvin<\/strong> \u00e9 a escala de temperatura em que o zero absoluto representa a aus\u00eancia de energia, cujo valor \u00e9 0 Kelvin (-273,15 \u00baC).<\/p>\n<p> O s\u00edmbolo usado para expressar uma temperatura em Kelvins \u00e9 a letra K mai\u00fascula, por exemplo 300 K.<\/p>\n<p> Na f\u00edsica, o kelvin n\u00e3o \u00e9 considerado um grau e portanto o nome correto para esta unidade de temperatura \u00e9 kelvin, e n\u00e3o <em>grau Kelvin<\/em> . Al\u00e9m disso, ao contr\u00e1rio do grau Celsius (\u00baC) e do grau Fahrenheit (\u00baF), n\u00e3o deve ser escrito com o s\u00edmbolo de grau, mas simplesmente com a letra K.<\/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-05df675eb7d5e9fe681327bdcca948c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"350 \\ \u00baK\\ \\color{red}\\bm{\\times} \\color{black}\\ \\longrightarrow \\ 350 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"233\" style=\"vertical-align: -1px;\"><\/p>\n<\/p>\n<p> Deve-se notar que embora o Kelvin seja a unidade de temperatura do Sistema Internacional, n\u00e3o \u00e9 a unidade mais comumente usada para expressar temperaturas. Sim, \u00e9 verdade que tanto na f\u00edsica como na engenharia os c\u00e1lculos s\u00e3o feitos em Kelvins, mas na vida quotidiana as temperaturas s\u00e3o geralmente medidas em graus Celsius ou Fahrenheit.<\/p>\n<p> Finalmente, as f\u00f3rmulas para converter de kelvins para outra unidade de temperatura s\u00e3o as seguintes:<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Convers\u00e3o de unidades de temperatura<\/th>\n<th> F\u00f3rmula<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> De Celsius a Kelvin<\/td>\n<td> K = \u00baC + 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Celsius<\/td>\n<td> \u00baC = K \u2013 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Fahrenheit<\/td>\n<td> \u00baF = 1,8 \u00b7 (K \u2013 273,15) + 32<\/td>\n<\/tr>\n<tr>\n<td> De Fahrenheit a Kelvin<\/td>\n<td> K = (\u00baF \u2013 32)\/1,8 + 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Rankine<\/td>\n<td> \u00baR = 1,8K<\/td>\n<\/tr>\n<tr>\n<td> De Rankine a Kelvin<\/td>\n<td> K =\u00baR\/1,8 <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Escala-Rankine\"><\/span> Escala Rankine<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p> A <strong>escala Rankine<\/strong> \u00e9 uma escala termom\u00e9trica baseada em graus Fahrenheit, que \u00e9 a unidade anglo-sax\u00f4nica de temperatura. Portanto, a escala Rankine usa a escala Fahrenheit, mas come\u00e7a no zero absoluto, ent\u00e3o zero grau Rankine \u00e9 equivalente ao zero absoluto de temperatura.<\/p>\n<p> O s\u00edmbolo para graus Rankine \u00e9 \u00baR, embora \u00baRa tamb\u00e9m seja usado algumas vezes.<\/p>\n<p> Aqui est\u00e3o alguns exemplos de temperaturas caracter\u00edsticas expressas na escala Rankine:<\/p>\n<ul>\n<li> 0 \u00baR: temperatura zero absoluto, equivalente a 0 K.<\/li>\n<li> 491,67 \u00baR: ponto de fus\u00e3o da \u00e1gua, igual a 0 \u00baC.<\/li>\n<li> 558,27 \u00baR: temperatura normal do corpo humano, que normalmente \u00e9 de 37 \u00baC.<\/li>\n<li> 671,64 \u00baR: ponto de ebuli\u00e7\u00e3o da \u00e1gua, que \u00e9 igual a 100 \u00baC<\/li>\n<\/ul>\n<p> As f\u00f3rmulas para passar da escala Rankine para outra escala termom\u00e9trica (e vice-versa) s\u00e3o as seguintes:<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Convers\u00e3o de unidades de temperatura<\/th>\n<th> F\u00f3rmula<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> De Rankine a Fahrenheit<\/td>\n<td> \u00baF = \u00baR \u2013 459,67<\/td>\n<\/tr>\n<tr>\n<td> De Fahrenheit a Rankine<\/td>\n<td> \u00baR = \u00baF + 459,67<\/td>\n<\/tr>\n<tr>\n<td> De Rankine a Kelvin<\/td>\n<td> K =\u00baR\/1,8<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Rankine<\/td>\n<td> \u00baR = 1,8K<\/td>\n<\/tr>\n<tr>\n<td> De Rankine a Celsius<\/td>\n<td> \u00baC = (\u00baR \u2013 491,67)\/1,8<\/td>\n<\/tr>\n<tr>\n<td> De Celsius a Rankine<\/td>\n<td> \u00baR = 1,8\u00b7(\u00baC + 273,15) <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Escalas-de-temperatura-absoluta-y-de-temperatura-relativa\"><\/span> Temperatura absoluta e escalas de temperatura relativa<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Acabamos de ver o significado de uma escala de temperatura absoluta, por\u00e9m, uma escala termom\u00e9trica tamb\u00e9m pode ser relativa. Nesta se\u00e7\u00e3o veremos como esses dois tipos de escalas de temperatura diferem.<\/p>\n<p> <strong>A diferen\u00e7a entre as escalas de temperatura absoluta e as escalas de temperatura relativa<\/strong> \u00e9 o valor que elas tomam como refer\u00eancia. As escalas de temperatura absoluta come\u00e7am na temperatura zero absoluto, enquanto as escalas de temperatura relativa t\u00eam uma temperatura arbitr\u00e1ria como o zero da escala.<\/p>\n<p> Assim, as escalas de temperatura relativa mais utilizadas s\u00e3o:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:15px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Escala Celsius<\/strong> : esta \u00e9 a escala termom\u00e9trica mais utilizada no dia a dia. Baseia-se nas temperaturas de fus\u00e3o e ebuli\u00e7\u00e3o da \u00e1gua, que s\u00e3o 0\u00baC e 100\u00baC respectivamente.<\/span><\/li>\n<li> <span style=\"color:#101010;font-weight: normal;\"><strong>Escala Fahernheit<\/strong> : escala termom\u00e9trica utilizada na maioria dos pa\u00edses de origem anglo-sax\u00f4nica. Zero na escala Fahrenheit corresponde a -17,78 \u00baC, da mesma forma, 1,8 graus Fahrenheit equivale a 1 grau Celsius.<\/span><\/li>\n<\/ul>\n<p> As f\u00f3rmulas para convers\u00e3o entre diferentes escalas de temperatura s\u00e3o as seguintes:<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Convers\u00e3o de escala de temperatura<\/th>\n<th> F\u00f3rmula<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> De Celsius a Kelvin<\/td>\n<td> K = \u00baC + 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Celsius<\/td>\n<td> \u00baC = K \u2013 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Celsius a Fahrenheit<\/td>\n<td> \u00baF = \u00baC \u00b7 1,8 + 32<\/td>\n<\/tr>\n<tr>\n<td> De Fahrenheit a Celsius<\/td>\n<td> \u00baC = (\u00baF \u2013 32)\/1,8<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Fahrenheit<\/td>\n<td> \u00baF = 1,8 \u00b7 (K \u2013 273,15) + 32<\/td>\n<\/tr>\n<tr>\n<td> De Fahrenheit a Kelvin<\/td>\n<td> K = (\u00baF \u2013 32)\/1,8 + 273,15<\/td>\n<\/tr>\n<tr>\n<td> De Celsius a Rankine<\/td>\n<td> \u00baR = 1,8\u00b7(\u00baC + 273,15)<\/td>\n<\/tr>\n<tr>\n<td> De Rankine a Celsius<\/td>\n<td> \u00baC = (\u00baR \u2013 491,67)\/1,8<\/td>\n<\/tr>\n<tr>\n<td> De Fahrenheit a Rankine<\/td>\n<td> \u00baR = \u00baF + 459,67<\/td>\n<\/tr>\n<tr>\n<td> De Rankine a Fahrenheit<\/td>\n<td> \u00baF = \u00baR \u2013 459,67<\/td>\n<\/tr>\n<tr>\n<td> De Kelvin a Rankine<\/td>\n<td> \u00baR = 1,8K<\/td>\n<\/tr>\n<tr>\n<td> Rankine em Kelvin<\/td>\n<td> K =\u00baR\/1,8<\/td>\n<\/tr>\n<tr>\n<td> Celsius para Rankine<\/td>\n<td> \u00baR = 1,8\u00b7(\u00baC + 273,15)<\/td>\n<\/tr>\n<tr>\n<td> Rankine para Celsius<\/td>\n<td> \u00baC = (\u00baR \u2013 491,67)\/1,8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 temperatura absoluta e o que \u00e9 uma escala de temperatura absoluta. Assim voc\u00ea encontrar\u00e1 a defini\u00e7\u00e3o de ambos os termos, quais s\u00e3o as escalas de temperatura absoluta e relativa e como convert\u00ea-las. O que \u00e9 temperatura absoluta? Temperatura absoluta \u00e9 o valor da temperatura medida em rela\u00e7\u00e3o ao zero &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/temperatura-absoluta\/\"> <span class=\"screen-reader-text\">Temperatura absoluta<\/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":[15],"tags":[],"class_list":["post-204","post","type-post","status-publish","format-standard","hentry","category-termodinamica"],"yoast_head":"<!-- This site is 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