{"id":48805,"date":"2019-11-12T07:03:05","date_gmt":"2019-11-12T06:03:05","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-densidade-fisica-definicao\/"},"modified":"2020-01-30T13:26:28","modified_gmt":"2020-01-30T12:26:28","slug":"o-que-e-densidade-fisica-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-densidade-fisica-definicao\/","title":{"rendered":"O que \u00e9 densidade &#8211; F\u00edsica &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O que \u00e9 densidade.\u00a0Por palavras, a densidade (\u03c1) de uma subst\u00e2ncia \u00e9 a massa total (m) dessa subst\u00e2ncia dividida pelo volume total (V) ocupado por essa subst\u00e2ncia.\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>O que \u00e9 densidade<\/h2>\n<figure id=\"attachment_16264\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-16264\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Density-Gas-Liquid-Solid-min.png\"><img loading=\"lazy\" class=\"wp-image-16264 size-medium lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Density-Gas-Liquid-Solid-min-241x300.png\" alt=\"Densidade - G\u00e1s - L\u00edquido - S\u00f3lido\" width=\"241\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Density-Gas-Liquid-Solid-min-241x300.png\" \/><\/a><figcaption id=\"caption-attachment-16264\" class=\"wp-caption-text\">Densidades t\u00edpicas de v\u00e1rias subst\u00e2ncias \u00e0 press\u00e3o atmosf\u00e9rica.<\/figcaption><\/figure>\n<p><strong>Densidade<\/strong>\u00a0\u00e9 definida como a\u00a0<strong>massa por unidade de volume<\/strong>\u00a0.\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, matematicamente definida como massa dividida por volume:<\/p>\n<p><strong>\u03c1 = m \/ V<\/strong><\/p>\n<p>Por palavras, a densidade (\u03c1) de uma subst\u00e2ncia \u00e9 a massa total (m) dessa subst\u00e2ncia dividida pelo volume total (V) ocupado por essa subst\u00e2ncia.\u00a0A unidade SI padr\u00e3o \u00e9 em\u00a0<strong>quilogramas por metro c\u00fabico<\/strong>\u00a0(\u00a0<strong>kg \/ m\u00a0<sup>3<\/sup><\/strong>\u00a0).\u00a0A unidade de ingl\u00eas padr\u00e3o \u00e9 a\u00a0<strong>libra-massa por p\u00e9 c\u00fabico<\/strong>\u00a0(\u00a0<strong>lbm \/ ft\u00a0<sup>3<\/sup><\/strong>\u00a0).\u00a0A densidade (\u03c1) de uma subst\u00e2ncia \u00e9 rec\u00edproca do seu\u00a0<strong>volume espec\u00edfico<\/strong>\u00a0(\u03bd).<\/p>\n<p><strong>\u03c1 = m \/ V = \u200b\u200b1 \/ \u03c1<\/strong><\/p>\n<p><strong>Volume espec\u00edfico<\/strong>\u00a0\u00e9 uma\u00a0<strong>vari\u00e1vel intensiva<\/strong>\u00a0, enquanto volume \u00e9 uma vari\u00e1vel extensa.\u00a0A unidade padr\u00e3o para volume espec\u00edfico no sistema SI \u00e9 de metros c\u00fabicos por quilograma (m\u00a0<sup>3<\/sup>\u00a0\/ kg).\u00a0A unidade padr\u00e3o no sistema ingl\u00eas \u00e9 de p\u00e9s c\u00fabicos por libra-peso (p\u00e9s\u00a0<sup>3<\/sup> \/ lbm).<\/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\"><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Coeficiente de temperatura do moderador - MTC\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/reactivity-coefficients-reactivity-feedbacks\/moderator-temperature-coefficient-mtc\/\"><span>Como a densidade influencia a reatividade do reator<\/span><\/a><\/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>Materiais mais densos da Terra<\/span><\/h2>\n<p><span>Como os\u00a0<\/span><strong><span>n\u00facleons<\/span><\/strong><span>\u00a0(\u00a0<\/span><strong><span>pr\u00f3tons<\/span><\/strong><span>\u00a0e\u00a0<\/span><a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\"><strong><span>n\u00eautrons<\/span><\/strong><\/a><span>\u00a0) comp\u00f5em a maior parte da massa de \u00e1tomos comuns, a densidade da mat\u00e9ria normal tende a ser limitada pela proximidade com a qual podemos empacotar esses n\u00facleons e depende da estrutura at\u00f4mica interna de uma subst\u00e2ncia.\u00a0O\u00a0<\/span><strong><span>material mais denso<\/span><\/strong><span>\u00a0encontrado na Terra \u00e9 o\u00a0<\/span><strong><span>\u00f3smio met\u00e1lico<\/span><\/strong><span>\u00a0, mas sua densidade empalidece em compara\u00e7\u00e3o com as densidades de objetos astron\u00f4micos ex\u00f3ticos, como\u00a0<\/span><strong><span>estrelas an\u00e3s<\/span><\/strong><span>\u00a0brancas\u00a0e\u00a0<\/span><strong><span>estrelas de n\u00eautrons<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><strong><span>Lista de materiais mais densos:<\/span><\/strong><\/p>\n<ol>\n<li><span>\u00d3smio &#8211; 22,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Ir\u00eddio &#8211; 22,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Platina &#8211; 21,5 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>R\u00eanio &#8211; 21,0 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Plut\u00f4nio &#8211; 19,8 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Ouro &#8211; 19,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Tungst\u00eanio &#8211; 19,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Ur\u00e2nio &#8211; 18,8 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>T\u00e2ntalo &#8211; 16,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Merc\u00fario &#8211; 13,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>R\u00f3dio &#8211; 12,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>T\u00f3rio &#8211; 11,7 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Chumbo &#8211; 11,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Prata &#8211; 10,5 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<\/ol>\n<p><span>Deve-se notar que o plut\u00f4nio \u00e9 um is\u00f3topo produzido pelo homem e \u00e9 criado a partir de\u00a0<\/span><a href=\"https:\/\/www.periodic-table.org\/uranium-periodic-table\/\"><span>ur\u00e2nio<\/span><\/a><span>\u00a0em\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\"><span>reatores nucleares<\/span><\/a><span>\u00a0.\u00a0Mas, de fato, os cientistas descobriram vest\u00edgios de plut\u00f4nio que ocorre naturalmente.<\/span><\/p>\n<p><span>Se incluirmos elementos feitos pelo homem, o mais denso at\u00e9 agora \u00e9 o\u00a0<\/span><strong><span>H\u00e1ssio<\/span><\/strong><span>\u00a0.\u00a0<\/span><strong><span>O h\u00e1ssio<\/span><\/strong><span>\u00a0\u00e9 um elemento qu\u00edmico com o s\u00edmbolo\u00a0<\/span><strong><span>Hs<\/span><\/strong><span>\u00a0e o n\u00famero at\u00f4mico 108. \u00c9 um elemento sint\u00e9tico (sintetizado pela primeira vez em Hasse na Alemanha) e radioativo.\u00a0O is\u00f3topo conhecido mais est\u00e1vel,\u00a0<\/span><strong><sup><span>269<\/span><\/sup><span>\u00a0Hs<\/span><\/strong><span>\u00a0, tem uma meia-vida de aproximadamente 9,7 segundos.\u00a0Tem uma densidade estimada de\u00a0<\/span><strong><span>40,7 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span>\u00a0.\u00a0A densidade do H\u00e1ssio resulta do seu\u00a0<\/span><strong><span>alto peso at\u00f4mico<\/span><\/strong><span>\u00a0e da diminui\u00e7\u00e3o significativa nos\u00a0<\/span><strong><span>raios i\u00f4nicos<\/span><\/strong><span>\u00a0dos elementos da s\u00e9rie dos lantan\u00eddeos, conhecidos como\u00a0<\/span><strong><span>contra\u00e7\u00e3o de lantan\u00eddeos e actin\u00eddeos<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>A densidade de Hassium \u00e9 seguida pelo\u00a0<\/span><strong><span>Meitnerium<\/span><\/strong><span>\u00a0(elemento 109, nomeado em homenagem \u00e0 f\u00edsica Lise Meitner), que tem uma densidade estimada de\u00a0<\/span><strong><span>37,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span> .<\/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>Densidade da mat\u00e9ria nuclear<\/span><\/h2>\n<p><strong><span>Densidade nuclear<\/span><\/strong><span>\u00a0\u00e9 a densidade do n\u00facleo de um \u00e1tomo.\u00a0\u00c9 a raz\u00e3o de massa por unidade de volume dentro do n\u00facleo.\u00a0Como o n\u00facleo at\u00f4mico carrega a maior parte da massa do \u00e1tomo e o n\u00facleo at\u00f4mico \u00e9 muito pequeno em compara\u00e7\u00e3o com o \u00e1tomo inteiro, a densidade nuclear \u00e9 muito alta.<\/span><\/p>\n<p><span>A densidade nuclear de um n\u00facleo t\u00edpico pode ser calculada aproximadamente a partir do tamanho do n\u00facleo e de sua massa.\u00a0<\/span><strong><span>Os\u00a0<\/span><a title=\"Raio Nuclear - Raio do N\u00facleo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/nuclear-radius-radius-of-nucleus\/\"><span>raios nucleares<\/span><\/a><\/strong><span><strong>\u00a0t\u00edpicos<\/strong>\u00a0s\u00e3o da ordem de\u00a0<\/span><strong><span>10 a\u00a0<\/span><\/strong><strong><sup><span>14<\/span><\/sup><\/strong><strong><span>\u00a0m<\/span><\/strong><span>\u00a0.\u00a0Assumindo a forma esf\u00e9rica, os raios nucleares podem ser calculados de acordo com a seguinte f\u00f3rmula:<\/span><\/p>\n<p><span>r = r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0.\u00a0A\u00a0<\/span><sup><span>1\/3<\/span><\/sup><\/p>\n<p><span>onde r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0= 1,2 x 10\u00a0<\/span><sup><span>-15<\/span><\/sup><span>\u00a0m = 1,2 fm<\/span><\/p>\n<p><span>Por exemplo,\u00a0<\/span><a title=\"Ur\u00e2nio natural\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/natural-uranium\/\"><strong><span>o ur\u00e2nio natural<\/span><\/strong><\/a><span>\u00a0consiste principalmente no is\u00f3topo\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><sup><span>238<\/span><\/sup><span>\u00a0U<\/span><\/a><span>\u00a0(99,28%), portanto, a massa at\u00f4mica do elemento ur\u00e2nio est\u00e1 pr\u00f3xima da massa at\u00f4mica do\u00a0is\u00f3topo\u00a0<\/span><sup><span>238<\/span><\/sup><span>\u00a0U (238,03u).\u00a0O raio deste n\u00facleo ser\u00e1:<\/span><\/p>\n<p><span>r = r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0.\u00a0A\u00a0<\/span><sup><span>1\/3<\/span><\/sup><span>\u00a0= 7,44 fm.<\/span><\/p>\n<p><span>Supondo que seja esf\u00e9rico, seu volume ser\u00e1:<\/span><\/p>\n<p><span>V = 4\u03c0r\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0\/3 = 1,73 x 10\u00a0<\/span><sup><span>-42<\/span><\/sup><span>\u00a0m\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0.<\/span><\/p>\n<p><span>A defini\u00e7\u00e3o usual de densidade nuclear fornece sua densidade:<\/span><\/p>\n<p><span>\u03c1\u00a0<\/span><sub><span>n\u00facleo<\/span><\/sub><span>\u00a0= m \/ V = 238 x 1,66 x 10\u00a0<\/span><sup><span>-27<\/span><\/sup><span>\u00a0\/ (1,73 x 10\u00a0<\/span><sup><span>-42<\/span><\/sup><span>\u00a0) =\u00a0<\/span><strong><span>2,3 x 10\u00a0<\/span><sup><span>17 de<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Assim, a densidade do material nuclear \u00e9 mais de 2,10\u00a0<\/span><sup><span>14<\/span><\/sup><span>\u00a0vezes maior que a da \u00e1gua.\u00a0\u00c9 uma densidade imensa.\u00a0O termo descritivo\u00a0<\/span><em><span>densidade nuclear<\/span><\/em><span>\u00a0tamb\u00e9m \u00e9 aplicado a situa\u00e7\u00f5es em que densidades similares ocorrem, como dentro de estrelas de n\u00eautrons.\u00a0Tais densidades imensas tamb\u00e9m s\u00e3o encontradas nas estrelas de n\u00eautrons.<\/span><\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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>O que \u00e9 densidade.\u00a0Por palavras, a densidade (\u03c1) de uma subst\u00e2ncia \u00e9 a massa total (m) dessa subst\u00e2ncia dividida pelo volume total (V) ocupado por essa subst\u00e2ncia.\u00a0Engenharia T\u00e9rmica O que \u00e9 densidade Densidades t\u00edpicas de v\u00e1rias subst\u00e2ncias \u00e0 press\u00e3o atmosf\u00e9rica. Densidade\u00a0\u00e9 definida como a\u00a0massa por unidade de volume\u00a0.\u00a0\u00c9 uma\u00a0propriedade intensiva\u00a0, matematicamente definida como massa dividida &#8230; <a title=\"O que \u00e9 densidade &#8211; F\u00edsica &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-densidade-fisica-definicao\/\" aria-label=\"More on O que \u00e9 densidade &#8211; F\u00edsica &#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 densidade - F\u00edsica - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O que \u00e9 densidade. 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