{"id":84,"date":"2023-06-26T06:28:12","date_gmt":"2023-06-26T06:28:12","guid":{"rendered":"https:\/\/physigeek.com\/pt\/escala-de-temperatura-kelvin\/"},"modified":"2023-06-26T06:28:12","modified_gmt":"2023-06-26T06:28:12","slug":"escala-de-temperatura-kelvin","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/escala-de-temperatura-kelvin\/","title":{"rendered":"Kelvin (escala de temperatura)"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 Kelvin e o que \u00e9 a escala Kelvin. Voc\u00ea descobrir\u00e1 como converter uma temperatura expressa em Kelvin para outras unidades de temperatura e, al\u00e9m disso, poder\u00e1 converter kelvin em graus Celsius ou graus Fahrenheit com um conversor online.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-el-kelvin\"><\/span> O que \u00e9 Kelvin?<span class=\"ez-toc-section-end\"><\/span><\/h2>\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> Por outro lado, 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 quanto na engenharia os c\u00e1lculos s\u00e3o feitos em Kelvins, mas na vida cotidiana as temperaturas s\u00e3o geralmente medidas em graus Celsius ou Fahrenheit. \u00c9 por isso que veremos a seguir como passar de certas unidades de temperatura para outras. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversion-de-kelvin-a-grados-Celsius\"><\/span> Convertendo Kelvin em graus Celsius<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Zero na escala Kelvin (0 K) equivale a -273,15\u00baC, portanto, para <strong>converter uma temperatura expressa em Kelvins para graus Celsius (ou Celsius),<\/strong> devem ser subtra\u00eddas 273,15 unidades do valor da temperatura.<\/p>\n<p> Assim, a f\u00f3rmula que permite converter um valor da escala Kelvin para a escala Celsius \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-3de831582a96e350afd9a292ff810653_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{blauquadreexample}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=blauquadreexample, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{blauquadreexample!20!white,} ]}]{equation*} \\displaystyle \u00baC= K-273.15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"310\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Por exemplo, se quisermos converter 450 K em graus Celsius, simplesmente subtra\u00edmos 273,15 da medida:<\/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-49ff44bd3e11e98103cce115c9c91c2f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 450 \\ K \\ \\color{vert}\\bm{\\longrightarrow}\\color{noir} \\ \u00baC \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"424\" 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-6d9872272f44e0348d4f2d4f6618d474_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\u00baC=450-273,15=176,85 \\ \u00baC\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"234\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p> Por outro lado, para <strong>converter uma temperatura expressa em graus Celsius em Kelvins,<\/strong> \u00e9 necess\u00e1rio adicionar 273,15 \u00e0 temperatura.<\/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-e50826f6b85bf9930df9bf113126b248_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \\displaystyle K= \u00baC+273,15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Como exemplo, a convers\u00e3o de 25\u00b0C para a escala Kelvin \u00e9 mostrada abaixo:<\/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-cd95bda80b5edb3191762d4395109b4a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 25 \\ \u00baC \\ \\color{vert}\\bm{\\longrightarrow}\\color{noir} \\ K \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"416\" 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-cba892f753f9e09fdad9ac3c2b11b41a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"K=25+273,15=298,15 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"229\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversion-de-kelvin-a-grados-Fahrenheit\"><\/span> Convers\u00e3o de Kelvin para Fahrenheit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Acabamos de ver como converter uma temperatura de kelvins para graus Celsius, por\u00e9m a escala Fahrenheit tamb\u00e9m \u00e9 amplamente utilizada. Portanto nesta se\u00e7\u00e3o veremos como passar da escala Kelvin para a escala Fahrenheit e vice-versa, j\u00e1 que o c\u00e1lculo n\u00e3o \u00e9 t\u00e3o direto como na escala Celsius.<\/p>\n<p> Para <strong>converter uma temperatura da escala Kelvin para a escala Fahrenheit,<\/strong> basta substituir o valor da temperatura expresso em Kelvins na seguinte f\u00f3rmula e fazer os c\u00e1lculos:<\/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-90a8934e8f855e60d4ba507a67185503_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \\displaystyle \u00baF= 1,8\\cdot (K-273,15)+32 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Por exemplo, a convers\u00e3o de 500 K em graus Fahrenheit \u00e9 feita da seguinte forma:<\/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-6536e287f7c608e83df83e9d3fecac67_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{vert}{HTML}{4FD12F} 500 \\ K \\ \\color{vert}\\bm{\\longrightarrow}\\color{black} \\ \u00baF \\ \\color{green}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"431\" 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-15a63236d1afd28031d3256d91a1fb93_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F=1,8\\cdot (500-273,15)+32=440,33 \\ \u00baF\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"325\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Da mesma forma, a f\u00f3rmula para fazer a convers\u00e3o inversa, ou seja <strong>, passar de graus Fahrenheit para Kelvins<\/strong> , \u00e9 obtida isolando o coeficiente da escala Kelvin da f\u00f3rmula anterior:<\/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-baff637c712d8293b69ae027c7d6a90c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\" \\definecolor{verd}{HTML}{4FD12F} \\newtcbox{\\mymath}[1][]{% nobeforeafter, math sup\u00e9rieur, tcbox raise base, am\u00e9lior\u00e9, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \\begin{empheq}[box={\\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{verd!20!white,} ]}]{equation*} \\displaystyle K= \\cfrac{\u00baF-32}{1.8}+273.15 \\end{empheq} \" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"192\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Para que voc\u00ea possa ver como o valor de uma temperatura passa entre essas duas medidas, foi resolvido um exemplo: <\/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-b577b31cebd30099db83223061e23ef1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\definecolor{verd}{HTML}{4FD12F} 250 \\ \u00baF \\ \\color{verd}\\bm{\\longrightarrow}\\color{black} \\ K \\ \\color{verd}\\bm{?}\\color{ noir}\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"427\" style=\"vertical-align: -1px;\"><\/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-c84a703969d9e96846662a8be28b6d84_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"K=\\cfrac{250-32}{1.8}+273.15=394.26 \\ K\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"274\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conversor-de-kelvin-a-grados-Celsius-y-grados-Fahrenheit\"><\/span> Conversor de Kelvin para Celsius e Fahrenheit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Para facilitar a convers\u00e3o entre diferentes unidades de temperatura, foi criada a seguinte calculadora online com a qual voc\u00ea pode converter um valor de temperatura entre as escalas termom\u00e9tricas Kelvin, Celsius e Fahrenheit.<\/p>\n<p> Para usar a calculadora, voc\u00ea precisa selecionar as unidades da temperatura inserida e escrever seu valor usando o ponto (.) como separador decimal.<\/p>\n<form action=\"\" method=\"post\">\n<ul style=\"color:#4FD12F\">\n<li> <span style=\"color:#101010;font-weight: normal;\"><select name=\"temperatura\" style=\"border:1.5px solid #CACFD2; border-radius:5px;  padding:7px; color:#000000; background-color:#F2F3F4;\" placeholder=\"7\"><option value=\"kelvin\">Kelvin<\/option><option value=\"celsius\">Graus Celsius<\/option><option value=\"fahrenheit\">Graus Fahrenheit<\/option><\/select> = <input name=\"datos\" style=\"border:1.5px solid #4FD12F; border-radius:5px;  padding:7px; color:#000000; background-color:#EEFCEB;\" placeholder=\"85.39\" required=\"\" oninvalid=\"this.setCustomValidity('Introduce la temperatura aqu\u00ed')\" oninput=\"this.setCustomValidity('')\"><\/span> <\/li>\n<\/ul>\n<div style=\"text-align:center\"><input align=\"center\" style=\"font-size:105%; border-radius:30px; margin: 20px;\" type=\"submit\" name=\"submit\" value=\"Converter\"><\/div>\n<\/form>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Origen-del-kelvin\"><\/span> Origem de Kelvin<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Nesta \u00faltima se\u00e7\u00e3o veremos a hist\u00f3ria relacionada ao kelvin, pois embora seja a unidade do Sistema Internacional, curiosamente n\u00e3o \u00e9 a unidade de temperatura mais utilizada.<\/p>\n<p> Antes da escala Kelvin, foram desenvolvidas as escalas termom\u00e9tricas Fahrenheit e Celsius, por isso hoje essas duas unidades s\u00e3o mais utilizadas no dia a dia.<\/p>\n<p> No entanto, estas escalas n\u00e3o s\u00e3o pr\u00e1ticas, uma vez que permitem temperaturas negativas. Ent\u00e3o, em 1848, William Thomson criou a <strong>escala termodin\u00e2mica de temperatura Kelvin<\/strong> , que toma a temperatura do zero absoluto como ponto nulo da escala. Portanto, apenas temperaturas positivas s\u00e3o permitidas.<\/p>\n<p> Ent\u00e3o, em 1954, durante a D\u00e9cima Confer\u00eancia Geral de Pesos e Medidas (CGPM), a temperatura do ponto triplo da \u00e1gua (273,16 K) foi definida como o segundo ponto de refer\u00eancia na escala Kelvin.<\/p>\n<p> Mais tarde, em 1967\/1968, durante a 13\u00aa CGPM, concluiu-se que um Kelvin correspondia ao aumento de uma unidade de temperatura. Da mesma forma, o Kelvin deixou de ser considerado um \u201cgrau\u201d e o s\u00edmbolo K substituiu, portanto, o \u00baK. A partir da\u00ed, tornou-se incorreto dizer <em>graus kelvin<\/em> , deveria simplesmente ser dito <em>kelvin<\/em> .<\/p>\n<p> Por fim, desde a 26\u00aa CGPM, realizada em 2018, o kelvin foi redefinido com base na constante de Boltzmann, um m\u00e9todo experimentalmente mais rigoroso.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 Kelvin e o que \u00e9 a escala Kelvin. Voc\u00ea descobrir\u00e1 como converter uma temperatura expressa em Kelvin para outras unidades de temperatura e, al\u00e9m disso, poder\u00e1 converter kelvin em graus Celsius ou graus Fahrenheit com um conversor online. O que \u00e9 Kelvin? O Kelvin , historicamente chamado de grau &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/escala-de-temperatura-kelvin\/\"> <span class=\"screen-reader-text\">Kelvin (escala de temperatura)<\/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-84","post","type-post","status-publish","format-standard","hentry","category-unidades"],"yoast_head":"<!-- This site is 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