{"id":48845,"date":"2019-11-12T10:13:58","date_gmt":"2019-11-12T09:13:58","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-mudanca-de-fase-transicao-de-fase-definicao\/"},"modified":"2020-01-30T13:35:18","modified_gmt":"2020-01-30T12:35:18","slug":"o-que-e-mudanca-de-fase-transicao-de-fase-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-mudanca-de-fase-transicao-de-fase-definicao\/","title":{"rendered":"O que \u00e9 mudan\u00e7a de fase &#8211; transi\u00e7\u00e3o de fase &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Na termodin\u00e2mica, uma mudan\u00e7a de fase ou tamb\u00e9m uma transi\u00e7\u00e3o de fase \u00e9 uma transi\u00e7\u00e3o entre estados s\u00f3lidos, l\u00edquidos e gasosos da mat\u00e9ria e, em casos raros, plasma.\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<\/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<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<h2><span>Exemplos<\/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<ul>\n<li class=\"inside-grid-column\">Evapora\u00e7\u00e3o da \u00e1gua \u00e0 press\u00e3o atmosf\u00e9rica<\/li>\n<li class=\"inside-grid-column\">Evapora\u00e7\u00e3o da \u00e1gua a alta press\u00e3o<\/li>\n<li class=\"inside-grid-column\">Evapora\u00e7\u00e3o da \u00e1gua a alta press\u00e3o &#8211; Balan\u00e7o energ\u00e9tico em um gerador de vapor\n<div class=\"su-accordion\"><\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<\/li>\n<\/ul>\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<h2><span>Sublima\u00e7\u00e3o<\/span><\/h2>\n<figure id=\"attachment_16113\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16113\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16113 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min-300x253.png\" alt=\"sublima\u00e7\u00e3o\" width=\"300\" height=\"253\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min-300x253.png\" \/><\/a><figcaption id=\"caption-attachment-16113\" class=\"wp-caption-text\"><span>Fonte: wikipedia.org CC BY-SA<\/span><\/figcaption><\/figure>\n<p><span>Em geral, a\u00a0<\/span><strong><span>sublima\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u00e9 uma\u00a0<\/span><strong><span>mudan\u00e7a<\/span><\/strong><span>\u00a0de\u00a0<strong>fase<\/strong>\u00a0de uma subst\u00e2ncia diretamente da fase s\u00f3lida para a fase gasosa sem passar pela fase l\u00edquida intermedi\u00e1ria.\u00a0<\/span><strong><span>A sublima\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u00e9 uma\u00a0<\/span><strong><span>altera\u00e7\u00e3o de fase endot\u00e9rmica<\/span><\/strong><span>\u00a0que ocorre a temperaturas e press\u00f5es\u00a0<\/span><strong><span>abaixo do ponto triplo de uma subst\u00e2ncia<\/span><\/strong><span>\u00a0em seu diagrama de fases.<\/span><\/p>\n<p><span>Considere o gelo a -10 \u00b0 C e \u00e0 press\u00e3o de 500 Pa. Nesse caso, a transfer\u00eancia de calor para o gelo resulta primeiro em um aumento da temperatura para -8 \u00b0 C.\u00a0Nesse ponto, no entanto, o gelo passa diretamente da fase s\u00f3lida para a fase de vapor no processo conhecido como sublima\u00e7\u00e3o.\u00a0O calor correspondente \u00e9 chamado de\u00a0<\/span><strong><span>calor da sublima\u00e7\u00e3o<\/span><\/strong><span>\u00a0, L\u00a0<\/span><sub><span>s<\/span><\/sub><span>\u00a0.\u00a0Transfer\u00eancia de calor adicional resultaria no superaquecimento do vapor.<\/span><\/p>\n<p><span>Como a sublima\u00e7\u00e3o \u00e9 uma mudan\u00e7a de fase endot\u00e9rmica, requer energia adicional.\u00a0Essa energia adicional necess\u00e1ria pode ser calculada adicionando a\u00a0<\/span><strong><span>entalpia de fus\u00e3o<\/span><\/strong><span>\u00a0e a\u00a0<\/span><strong><span>entalpia de vaporiza\u00e7\u00e3o<\/span><\/strong><span>\u00a0e \u00e9 conhecida como entalpia de sublima\u00e7\u00e3o (tamb\u00e9m chamada calor de sublima\u00e7\u00e3o).<\/span><\/p>\n<p><span>Para algumas subst\u00e2ncias, a sublima\u00e7\u00e3o \u00e9 muito mais f\u00e1cil do que a evapora\u00e7\u00e3o do fundido.\u00a0Depende do ponto triplo.\u00a0Quando a press\u00e3o do seu ponto triplo \u00e9 muito alta, \u00e9 dif\u00edcil obt\u00ea-los como l\u00edquidos.<\/span><\/p>\n<p><span>O processo inverso de sublima\u00e7\u00e3o \u00e9 a sublima\u00e7\u00e3o, na qual uma subst\u00e2ncia passa diretamente de um g\u00e1s para uma fase s\u00f3lida.<\/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>Desublima\u00e7\u00e3o<\/span><\/h2>\n<figure id=\"attachment_16113\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16113\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16113 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min-300x253.png\" alt=\"sublima\u00e7\u00e3o\" width=\"300\" height=\"253\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sublimation-Desublimation-min-300x253.png\" \/><\/a><figcaption id=\"caption-attachment-16113\" class=\"wp-caption-text\"><span>Fonte: wikipedia.org CC BY-SA<\/span><\/figcaption><\/figure>\n<p><span>Em geral, a\u00a0<\/span><strong><span>dessublima\u00e7\u00e3o<\/span><\/strong><span>\u00a0(ou\u00a0<\/span><strong><span>deposi\u00e7\u00e3o<\/span><\/strong><span>\u00a0) \u00e9 uma\u00a0<\/span><strong><span>transi\u00e7\u00e3o<\/span><\/strong><span>\u00a0de\u00a0<strong>fase<\/strong>\u00a0de uma subst\u00e2ncia\u00a0<\/span><strong><span>diretamente<\/span><\/strong><span>\u00a0da\u00a0<\/span><strong><span>fase gasosa<\/span><\/strong><span>\u00a0para a\u00a0<\/span><strong><span>fase s\u00f3lida<\/span><\/strong><span>\u00a0sem passar pela fase l\u00edquida intermedi\u00e1ria.\u00a0A sublima\u00e7\u00e3o \u00e9 uma\u00a0<strong>mudan\u00e7a de\u00a0<\/strong><\/span><strong><span>fase exot\u00e9rmica<\/span><\/strong>\u00a0<span>que ocorre a temperaturas e press\u00f5es\u00a0<strong>abaixo<\/strong>\u00a0do\u00a0<strong>ponto triplo de<\/strong>\u00a0uma subst\u00e2ncia\u00a0em seu diagrama de fases.<\/span><\/p>\n<p><span>Considere o vapor de \u00e1gua a -5 \u00b0 C e \u00e0 press\u00e3o de 500 Pa. Nesse caso, quando o calor \u00e9 retirado do vapor de \u00e1gua, o vapor resulta em uma diminui\u00e7\u00e3o da temperatura para -8 \u00b0 C.\u00a0Nesse ponto, no entanto, o vapor passa diretamente da fase gasosa para a fase s\u00f3lida no processo conhecido como desublima\u00e7\u00e3o.\u00a0O calor correspondente \u00e9 chamado de\u00a0<\/span><strong><span>calor da sublima\u00e7\u00e3o<\/span><\/strong><span>\u00a0, L\u00a0<\/span><sub><span>s<\/span><\/sub><span>\u00a0.<\/span><\/p>\n<p><span>Como a dessublima\u00e7\u00e3o \u00e9 uma mudan\u00e7a de fase exot\u00e9rmica, libera energia.\u00a0Essa energia liberada pode ser calculada adicionando a entalpia da fus\u00e3o e a entalpia da vaporiza\u00e7\u00e3o e \u00e9 conhecida como entalpia da sublima\u00e7\u00e3o (tamb\u00e9m chamada calor da sublima\u00e7\u00e3o).<\/span><\/p>\n<p><span>Para algumas subst\u00e2ncias, a desublima\u00e7\u00e3o \u00e9 muito mais f\u00e1cil do que passar pela fase l\u00edquida.\u00a0Depende do ponto triplo.\u00a0Quando a press\u00e3o do seu ponto triplo \u00e9 muito alta, \u00e9 dif\u00edcil obt\u00ea-los como l\u00edquidos.<\/span><\/p>\n<p><span>O processo inverso de dessublima\u00e7\u00e3o \u00e9 a sublima\u00e7\u00e3o, na qual uma subst\u00e2ncia passa diretamente da fase s\u00f3lida para a fase gasosa.<\/span><\/p>\n<p><span>Um exemplo de desublima\u00e7\u00e3o \u00e9 quando a\u00a0<\/span><strong><span>geada se<\/span><\/strong><span>\u00a0forma em uma folha no inverno.\u00a0Para ocorrer desublima\u00e7\u00e3o, a energia t\u00e9rmica deve ser removida de um g\u00e1s.\u00a0Portanto, quando a folha fica fria o suficiente, o vapor de \u00e1gua no ar ao redor da folha pode perder energia t\u00e9rmica suficiente para mudar diretamente para um s\u00f3lido.<\/span><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\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=\"su-spoiler-content su-clearfix\">\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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Na termodin\u00e2mica, uma mudan\u00e7a de fase ou tamb\u00e9m uma transi\u00e7\u00e3o de fase \u00e9 uma transi\u00e7\u00e3o entre estados s\u00f3lidos, l\u00edquidos e gasosos da mat\u00e9ria e, em casos raros, plasma.\u00a0Engenharia T\u00e9rmica Exemplos Evapora\u00e7\u00e3o da \u00e1gua \u00e0 press\u00e3o atmosf\u00e9rica Evapora\u00e7\u00e3o da \u00e1gua a alta press\u00e3o Evapora\u00e7\u00e3o da \u00e1gua a alta press\u00e3o &#8211; Balan\u00e7o energ\u00e9tico em um gerador de &#8230; <a title=\"O que \u00e9 mudan\u00e7a de fase &#8211; transi\u00e7\u00e3o de fase &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-mudanca-de-fase-transicao-de-fase-definicao\/\" aria-label=\"More on O que \u00e9 mudan\u00e7a de fase &#8211; transi\u00e7\u00e3o de fase &#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 mudan\u00e7a de fase - transi\u00e7\u00e3o de fase - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Na termodin\u00e2mica, uma mudan\u00e7a de fase ou tamb\u00e9m uma transi\u00e7\u00e3o de fase \u00e9 uma transi\u00e7\u00e3o entre estados s\u00f3lidos, l\u00edquidos e gasosos da mat\u00e9ria e, em casos raros, plasma. 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