{"id":48817,"date":"2019-11-12T07:58:01","date_gmt":"2019-11-12T06:58:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-mudanca-de-densidade-definicao\/"},"modified":"2020-01-30T13:28:12","modified_gmt":"2020-01-30T12:28:12","slug":"o-que-e-mudanca-de-densidade-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-mudanca-de-densidade-definicao\/","title":{"rendered":"O que \u00e9 mudan\u00e7a de densidade – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Em geral, a densidade pode ser alterada alterando a press\u00e3o ou a temperatura.\u00a0Aumentar a press\u00e3o sempre aumenta a densidade de um material.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Mudan\u00e7as de densidade<\/h2>\n

Em geral, a\u00a0densidade<\/strong>\u00a0pode ser\u00a0alterada<\/strong>\u00a0alterando a\u00a0press\u00e3o<\/strong>\u00a0ou a\u00a0temperatura<\/strong>\u00a0.\u00a0Aumentar a\u00a0press\u00e3o sempre aumenta<\/strong>\u00a0a\u00a0densidade<\/strong>\u00a0de um material.\u00a0O efeito da press\u00e3o nas densidades de\u00a0l\u00edquidos<\/strong>\u00a0e\u00a0s\u00f3lidos<\/strong>\u00a0\u00e9 muito pequeno.\u00a0Por outro lado, a densidade dos gases \u00e9 fortemente afetada pela press\u00e3o.\u00a0Isso \u00e9 expresso pela\u00a0compressibilidade<\/strong>\u00a0.\u00a0Compressibilidade<\/strong>\u00a0\u00e9 uma medida da mudan\u00e7a relativa de volume de um fluido ou s\u00f3lido como resposta a uma mudan\u00e7a de press\u00e3o.<\/p>\n

O\u00a0efeito da temperatura<\/strong>\u00a0nas densidades de l\u00edquidos e s\u00f3lidos tamb\u00e9m \u00e9 muito importante.\u00a0A maioria das subst\u00e2ncias se\u00a0expande quando aquecida<\/strong>\u00a0e se\u00a0contrai quando resfriada<\/strong>\u00a0.\u00a0No entanto, a quantidade de expans\u00e3o ou contra\u00e7\u00e3o varia, dependendo do material.\u00a0Esse fen\u00f4meno \u00e9 conhecido como\u00a0expans\u00e3o t\u00e9rmica<\/strong>\u00a0.\u00a0A mudan\u00e7a no volume de um material que sofre uma mudan\u00e7a de temperatura \u00e9 dada pela seguinte rela\u00e7\u00e3o:<\/p>\n

\"expans\u00e3o<\/a><\/p>\n

em que AT \u00e9 a altera\u00e7\u00e3o de temperatura, V \u00e9 o volume original, AV, \u00e9 a altera\u00e7\u00e3o de volume, e\u00a0\u03b1\u00a0V<\/sub><\/strong>\u00a0\u00e9 o\u00a0coeficiente de expans\u00e3o de volume<\/strong>\u00a0.<\/p>\n

Deve-se notar, h\u00e1 exce\u00e7\u00f5es a esta regra.\u00a0Por exemplo, a\u00a0\u00e1gua<\/strong>\u00a0difere da maioria dos l\u00edquidos, pois se torna\u00a0menos densa \u00e0 medida que congela<\/strong>\u00a0.\u00a0Tem uma densidade m\u00e1xima de 3,98 \u00b0 C (1000 kg \/ m\u00a03<\/sup>\u00a0), enquanto a densidade do gelo \u00e9 de 917 kg \/ m\u00a03<\/sup>\u00a0.\u00a0Diferentemente, a\u00a0\u00e1gua \u00e9<\/strong>\u00a0l\u00edquida,\u00a0e o\u00a0gelo flutua<\/strong>\u00a0sobre a \u00e1gua l\u00edquida, como tamb\u00e9m a\u00a0densidade influencia a reatividade do reator.<\/a><\/p>\n<\/div>\n<\/div>\n

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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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Em geral, a densidade pode ser alterada alterando a press\u00e3o ou a temperatura.\u00a0Aumentar a press\u00e3o sempre aumenta a densidade de um material.\u00a0Engenharia T\u00e9rmica Mudan\u00e7as de densidade Em geral, a\u00a0densidade\u00a0pode ser\u00a0alterada\u00a0alterando a\u00a0press\u00e3o\u00a0ou a\u00a0temperatura\u00a0.\u00a0Aumentar a\u00a0press\u00e3o sempre aumenta\u00a0a\u00a0densidade\u00a0de um material.\u00a0O efeito da press\u00e3o nas densidades de\u00a0l\u00edquidos\u00a0e\u00a0s\u00f3lidos\u00a0\u00e9 muito pequeno.\u00a0Por outro lado, a densidade dos gases \u00e9 fortemente afetada pela … 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":"\nO que \u00e9 mudan\u00e7a de densidade - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em geral, a densidade pode ser alterada alterando a press\u00e3o ou a temperatura. 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