{"id":48493,"date":"2019-11-10T21:59:30","date_gmt":"2019-11-10T20:59:30","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-formula-interna-de-energia-definicao\/"},"modified":"2020-01-29T13:24:46","modified_gmt":"2020-01-29T12:24:46","slug":"o-que-e-a-formula-interna-de-energia-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-formula-interna-de-energia-definicao\/","title":{"rendered":"O que \u00e9 a F\u00f3rmula Interna de Energia &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">F\u00f3rmula de energia interna.\u00a0A energia interna \u00e9 o total de toda a energia associada ao movimento dos \u00e1tomos ou mol\u00e9culas no sistema.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Energia microsc\u00f3pica<\/h2>\n<p><strong>A energia interna<\/strong>\u00a0envolve energia na\u00a0<strong>escala microsc\u00f3pica<\/strong>\u00a0.\u00a0Pode ser dividido em energia microsc\u00f3pica potencial,\u00a0<sub>pote\u00a0<\/sub><em>U<\/em>\u00a0e energia cin\u00e9tica microsc\u00f3pica,\u00a0<em>U\u00a0<\/em><sub>kin<\/sub>\u00a0, componentes:<\/p>\n<p><strong>U = U\u00a0<sub>pote<\/sub>\u00a0+ U\u00a0<sub>parentes<\/sub><\/strong><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/microscopic-energy-internal-energy.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16656 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/microscopic-energy-internal-energy-300x196.png\" alt=\"Energia microsc\u00f3pica - energia interna\" width=\"300\" height=\"196\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/microscopic-energy-internal-energy-300x196.png\" \/><\/a>onde a energia cin\u00e9tica microsc\u00f3pica, U\u00a0<sub>kin<\/sub>\u00a0, envolve os\u00a0<strong>movimentos<\/strong>\u00a0de todas as part\u00edculas do sistema em rela\u00e7\u00e3o \u00e0 estrutura do centro de massa.\u00a0Para um\u00a0<strong>g\u00e1s monat\u00f4mico<\/strong>\u00a0ideal\u00a0, essa \u00e9 apenas a\u00a0<strong>energia cin\u00e9tica translacional<\/strong>\u00a0do movimento linear dos \u00e1tomos.\u00a0Part\u00edculas monoat\u00f4micas n\u00e3o giram ou vibram.\u00a0O comportamento do sistema \u00e9 bem descrito pela teoria cin\u00e9tica dos gases.\u00a0A teoria cin\u00e9tica baseia-se no fato de que durante uma\u00a0<a href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/elastic-collisions\/\">colis\u00e3o el\u00e1stica<\/a>\u00a0entre uma mol\u00e9cula com alta energia cin\u00e9tica e outra com baixa energia cin\u00e9tica, parte da energia ser\u00e1 transferida para a mol\u00e9cula de energia cin\u00e9tica inferior.\u00a0No entanto, para\u00a0<strong>gases poliat\u00f4micos,<\/strong>\u00a0existem\u00a0<strong>rota\u00e7\u00f5es<\/strong>\u00a0e<strong>energia cin\u00e9tica vibracional<\/strong>\u00a0tamb\u00e9m.<\/p>\n<p>A energia potencial microsc\u00f3pica,\u00a0<strong>U\u00a0<sub>pot<\/sub><\/strong>\u00a0, envolve as\u00a0<strong>liga\u00e7\u00f5es qu\u00edmicas<\/strong>\u00a0entre os \u00e1tomos que comp\u00f5em as mol\u00e9culas, as for\u00e7as de liga\u00e7\u00e3o no n\u00facleo e tamb\u00e9m os campos de for\u00e7a f\u00edsica no sistema (por exemplo, campos el\u00e9tricos ou magn\u00e9ticos).<\/p>\n<p>Em l\u00edquidos e s\u00f3lidos, h\u00e1 um componente significativo da energia potencial associada \u00e0s\u00a0<strong>for\u00e7as de atra\u00e7\u00e3o intermoleculares<\/strong>\u00a0.<\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Energia interna espec\u00edfica<\/h2>\n<p>A\u00a0<strong>energia interna espec\u00edfica (u)<\/strong>\u00a0de uma subst\u00e2ncia \u00e9 sua energia interna por unidade de massa.\u00a0\u00c9 uma\u00a0<a title=\"Propriedades extensivas e intensivas\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/extensive-and-intensive-properties\/\"><strong>propriedade intensiva<\/strong><\/a>\u00a0.\u00a0\u00c9 igual \u00e0 energia interna total (U) dividida pela massa total (m).<\/p>\n<p><em><strong>u = U \/ m<\/strong><\/em><\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><span>Onde:<\/span><\/p>\n<p><span>u = energia interna espec\u00edfica (J \/ kg)<\/span><\/p>\n<p><span>U = energia interna (J)<\/span><\/p>\n<p><span>m = massa (kg)<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Energia interna de um g\u00e1s ideal<\/span><\/h2>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\"><span>A\u00a0<\/span><strong><span>energia interna<\/span><\/strong><span>\u00a0\u00e9 o total de toda a energia associada ao movimento dos \u00e1tomos ou mol\u00e9culas no sistema.\u00a0As formas microsc\u00f3picas de energia incluem aquelas devidas \u00e0\u00a0<\/span><strong><span>rota\u00e7\u00e3o<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>vibra\u00e7\u00e3o<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>tradu\u00e7\u00e3o<\/span><\/strong><span>\u00a0e intera\u00e7\u00f5es entre as mol\u00e9culas de uma subst\u00e2ncia.<\/span><\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>G\u00e1s Monat\u00f4mico<\/span><\/h2>\n<p><span>Para um\u00a0<\/span><strong><span>g\u00e1s ideal monat\u00f4mico<\/span><\/strong><span>\u00a0(como h\u00e9lio, n\u00e9on ou arg\u00f4nio), a \u00fanica contribui\u00e7\u00e3o para a energia vem da\u00a0<\/span><strong><span>energia cin\u00e9tica translacional<\/span><\/strong><span>\u00a0.\u00a0A energia cin\u00e9tica translacional m\u00e9dia de um \u00fanico \u00e1tomo depende apenas da temperatura do g\u00e1s e \u00e9 dada pela equa\u00e7\u00e3o<\/span><\/p>\n<p><strong><span>K\u00a0<\/span><sub><span>m\u00e9d<\/span><\/sub><span>\u00a0= 3\/2 kT.<\/span><\/strong><\/p>\n<p><span>A\u00a0<\/span><strong><span>energia interna<\/span><\/strong><span>\u00a0de n moles de um g\u00e1s monat\u00f4mico ideal (um \u00e1tomo por mol\u00e9cula) \u00e9 igual \u00e0 energia cin\u00e9tica m\u00e9dia por mol\u00e9cula vezes o n\u00famero total de mol\u00e9culas, N:<\/span><\/p>\n<p><strong><span>E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0= 3\/2 NkT = 3\/2 nRT<\/span><\/strong><\/p>\n<p><span>onde n \u00e9 o n\u00famero de moles.\u00a0Cada dire\u00e7\u00e3o (x, ye z) contribui\u00a0<\/span><strong><span>(1\/2) nRT<\/span><\/strong><span>\u00a0para a energia interna.\u00a0\u00c9 aqui que entra a id\u00e9ia da equiparti\u00e7\u00e3o de energia &#8211; qualquer outra contribui\u00e7\u00e3o para a energia tamb\u00e9m deve contribuir (1\/2) nRT.\u00a0Como pode ser visto, a energia interna de um g\u00e1s ideal\u00a0<\/span><strong><span>depende apenas da temperatura<\/span><\/strong><span>\u00a0e do n\u00famero de mols de g\u00e1s.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Mol\u00e9cula Diat\u00f4mica<\/span><\/h2>\n<p><span>Se as mol\u00e9culas de g\u00e1s cont\u00eam mais de um \u00e1tomo, existem\u00a0<\/span><strong><span>tr\u00eas dire\u00e7\u00f5es de transla\u00e7\u00e3o<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>a energia cin\u00e9tica rotacional<\/span><\/strong><span>\u00a0tamb\u00e9m contribui, mas apenas para rota\u00e7\u00f5es em torno de dois dos tr\u00eas eixos perpendiculares.\u00a0As cinco contribui\u00e7\u00f5es para a energia (cinco graus de liberdade) fornecem:<\/span><\/p>\n<p><span>G\u00e1s ideal diat\u00f4mico:<\/span><\/p>\n<p><strong><span>E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0= (5\/2) NkT = (5\/2) nRT<\/span><\/strong><\/p>\n<p><span>Esta \u00e9 apenas uma aproxima\u00e7\u00e3o e se aplica a temperaturas intermedi\u00e1rias.\u00a0Em baixas temperaturas, apenas a energia cin\u00e9tica translacional contribui e, em temperaturas mais altas, duas contribui\u00e7\u00f5es adicionais (energia cin\u00e9tica e potencial) v\u00eam da vibra\u00e7\u00e3o.<\/span><\/p>\n<p><span>A energia interna ser\u00e1 maior a uma dada temperatura do que para um g\u00e1s monat\u00f4mico, mas ainda ser\u00e1 uma fun\u00e7\u00e3o apenas da temperatura para um g\u00e1s ideal.<\/span><\/p>\n<p><span>A energia interna dos gases reais tamb\u00e9m depende principalmente da temperatura, mas, da mesma forma que a\u00a0<\/span><strong><span>Lei do G\u00e1s Ideal<\/span><\/strong><span>\u00a0, a energia interna dos gases reais tamb\u00e9m depende um pouco da press\u00e3o e do volume.\u00a0Todos os gases reais se aproximam do estado ideal a baixas press\u00f5es (densidades).\u00a0A baixas press\u00f5es, as mol\u00e9culas est\u00e3o suficientemente afastadas para que n\u00e3o interajam.\u00a0A energia interna de l\u00edquidos e s\u00f3lidos \u00e9 bastante complicada, pois inclui energia potencial el\u00e9trica associada \u00e0s for\u00e7as (ou liga\u00e7\u00f5es &#8220;qu\u00edmicas&#8221;) entre \u00e1tomos e mol\u00e9culas.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Energia Interna e a Primeira Lei da Termodin\u00e2mica<\/span><\/h2>\n<p><strong><span>Na termodin\u00e2mica,<\/span><\/strong><span>\u00a0o conceito de energia \u00e9 ampliado para dar conta de outras mudan\u00e7as observadas, e o\u00a0<\/span><strong><span>princ\u00edpio de conserva\u00e7\u00e3o de energia<\/span><\/strong><span>\u00a0\u00e9 estendido para incluir uma ampla variedade de maneiras pelas quais os sistemas interagem com seus arredores.\u00a0As \u00fanicas maneiras pelas quais a energia de um sistema fechado pode ser alterada s\u00e3o atrav\u00e9s da transfer\u00eancia de energia\u00a0<\/span><strong><span>pelo trabalho<\/span><\/strong><span>\u00a0ou\u00a0<\/span><strong><span>pelo calor<\/span><\/strong><span>\u00a0.\u00a0Al\u00e9m disso, com base nos experimentos de Joule e outros, um aspecto fundamental do conceito de energia \u00e9 que a\u00a0<\/span><strong><span>energia \u00e9 conservada.\u00a0<\/span><\/strong><span>Este princ\u00edpio \u00e9 conhecido como\u00a0\u00a0<\/span><strong><span>a primeira lei da termodin\u00e2mica<\/span><\/strong><span>\u00a0.\u00a0A primeira lei da termodin\u00e2mica pode ser escrita de v\u00e1rias formas:<\/span><\/p>\n<p><strong><span>Em palavras:<\/span><\/strong><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-of-thermodynamics-in-words.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15717 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-of-thermodynamics-in-words.png\" alt=\"primeira lei da termodin\u00e2mica em palavras\" width=\"521\" height=\"105\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/first-law-of-thermodynamics-in-words.png\" \/><\/a><\/p>\n<figure id=\"attachment_15716\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-15716\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservation-of-energy-in-thermodynamics.png\"><img loading=\"lazy\" class=\"wp-image-15716 size-medium lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservation-of-energy-in-thermodynamics-201x300.png\" alt=\"conserva\u00e7\u00e3o de energia em termodin\u00e2mica\" width=\"201\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservation-of-energy-in-thermodynamics-201x300.png\" \/><\/a><figcaption id=\"caption-attachment-15716\" class=\"wp-caption-text\"><span>Layout f\u00edsico dos quatro principais dispositivos utilizados no ciclo Rankine e transfer\u00eancias b\u00e1sicas de energia.<\/span><\/figcaption><\/figure>\n<p><strong><span>Forma da equa\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><strong><span>IntE\u00a0<\/span><\/strong><strong><sub><span>int<\/span><\/sub><\/strong><strong><span>\u00a0= Q &#8211; W<\/span><\/strong><\/p>\n<p><span>onde\u00a0<\/span><strong><span>E\u00a0<\/span><sub><span>int<\/span><\/sub><\/strong><span>\u00a0representa a\u00a0<\/span><strong><span>energia interna<\/span><\/strong><span>\u00a0do material, que depende apenas\u00a0<\/span><strong><span>do estado do material<\/span><\/strong><span>\u00a0(temperatura, press\u00e3o e volume).\u00a0<\/span><strong><span>Q<\/span><\/strong><span>\u00a0\u00e9 o\u00a0<\/span><strong><span>calor l\u00edquido adicionado<\/span><\/strong><span>\u00a0ao sistema e\u00a0<\/span><strong><span>W<\/span><\/strong><span>\u00a0\u00e9 o\u00a0<\/span><strong><span>trabalho l\u00edquido realizado pelo<\/span><\/strong><span>\u00a0sistema.\u00a0Devemos ser cuidadosos e consistentes ao seguir as conven\u00e7\u00f5es de sinal para Q e W. Como W na equa\u00e7\u00e3o \u00e9 o trabalho realizado pelo sistema, se o trabalho for realizado no sistema, W ser\u00e1 negativo e E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0aumentar\u00e1.<\/span><\/p>\n<p><span>Da mesma forma, Q \u00e9 positivo para o calor adicionado ao sistema; portanto, se o calor sai do sistema, Q \u00e9 negativo.\u00a0Isso nos diz o seguinte: A\u00a0<\/span><strong><span>energia interna<\/span><\/strong><span>\u00a0de um sistema tende a aumentar se o calor for absorvido pelo sistema ou se um trabalho positivo for feito no sistema.\u00a0Por outro lado, a energia interna tende a diminuir se o calor for perdido pelo sistema ou se for feito um trabalho negativo no sistema.\u00a0Deve-se adicionar Q e W dependem do caminho, enquanto E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0\u00e9 independente do caminho.<\/span><\/p>\n<p><strong><span>Forma diferencial:<\/span><\/strong><\/p>\n<p><strong><span>dE\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0= dQ &#8211; dW<\/span><\/strong><\/p>\n<p><span>A energia interna E\u00a0<\/span><sub><span>int<\/span><\/sub><span>\u00a0de um sistema tende a aumentar se a energia \u00e9 adicionada como calor Q e tende a diminuir se a energia \u00e9 perdida como o trabalho W realizado pelo sistema.<\/span><\/p>\n<p><strong><span>Vide tamb\u00e9m:\u00a0<\/span><a title=\"Sistema Aberto - Sistema Fechado - Sistema Isolado\" href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/open-system-closed-system-isolated-system\/\"><span>Sistema aberto &#8211; Sistema fechado &#8211; Sistema isolado<\/span><\/a><\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>F\u00f3rmula de energia interna.\u00a0A energia interna \u00e9 o total de toda a energia associada ao movimento dos \u00e1tomos ou mol\u00e9culas no sistema.\u00a0Engenharia T\u00e9rmica Energia microsc\u00f3pica A energia interna\u00a0envolve energia na\u00a0escala microsc\u00f3pica\u00a0.\u00a0Pode ser dividido em energia microsc\u00f3pica potencial,\u00a0pote\u00a0U\u00a0e energia cin\u00e9tica microsc\u00f3pica,\u00a0U\u00a0kin\u00a0, componentes: U = U\u00a0pote\u00a0+ U\u00a0parentes onde a energia cin\u00e9tica microsc\u00f3pica, U\u00a0kin\u00a0, envolve os\u00a0movimentos\u00a0de todas as &#8230; <a title=\"O que \u00e9 a F\u00f3rmula Interna de Energia &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-formula-interna-de-energia-definicao\/\" aria-label=\"More on O que \u00e9 a F\u00f3rmula Interna de Energia &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 a F\u00f3rmula Interna de Energia - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"F\u00f3rmula de energia interna. 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