{"id":48448,"date":"2019-11-10T13:34:37","date_gmt":"2019-11-10T12:34:37","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-alteracao-de-entropia-exemplo-definicao\/"},"modified":"2020-01-29T12:16:14","modified_gmt":"2020-01-29T11:16:14","slug":"o-que-e-alteracao-de-entropia-exemplo-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-alteracao-de-entropia-exemplo-definicao\/","title":{"rendered":"O que \u00e9 altera\u00e7\u00e3o de entropia – Exemplo – Defini\u00e7\u00e3o"},"content":{"rendered":"
\n
Altera\u00e7\u00e3o de entropia – Exemplo.\u00a0Calcule a varia\u00e7\u00e3o na entropia de 1 kg de gelo a 0 \u00b0 C, quando derretida reversivelmente em \u00e1gua a 0 \u00b0 C.\u00a0Por se tratar de um processo isot\u00e9rmico, podemos usar: =S = S2 – S1 = Q \/ T<\/div>\n<\/div>\n
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Altera\u00e7\u00e3o de entropia<\/h2>\n

O SI\u00a0unidade de entropia<\/strong>\u00a0\u00e9\u00a0J \/ K<\/strong>\u00a0.\u00a0Segundo Clausius, a entropia foi definida atrav\u00e9s da mudan\u00e7a na entropia S de um sistema.\u00a0A mudan\u00e7a na entropia S, quando uma quantidade de calor Q \u00e9 adicionada a ela por um processo revers\u00edvel a temperatura constante, \u00e9 dada por:<\/p>\n

\"Equa\u00e7\u00e3o<\/a><\/p>\n

Aqui\u00a0Q<\/strong>\u00a0\u00e9 a\u00a0energia transferida<\/strong>\u00a0como calor para ou do sistema durante o processo e T \u00e9 a temperatura do sistema em Kelvins durante o processo.\u00a0Se assumirmos um\u00a0processo isot\u00e9rmico<\/strong>\u00a0revers\u00edvel\u00a0, a altera\u00e7\u00e3o total da entropia \u00e9 dada por:<\/p>\n

\u2206S = S\u00a02<\/sub>\u00a0– S\u00a01<\/sub>\u00a0= Q \/ T<\/strong><\/em><\/p>\n

Nesta equa\u00e7\u00e3o, o\u00a0quociente Q \/ T<\/strong>\u00a0est\u00e1 relacionado ao aumento do dist\u00farbio.\u00a0Uma temperatura mais alta significa maior aleatoriedade de movimento.\u00a0Em temperaturas mais baixas, a adi\u00e7\u00e3o de calor Q causa um aumento fracion\u00e1rio substancial no movimento molecular e na aleatoriedade.\u00a0Por outro lado, se a subst\u00e2ncia j\u00e1 estiver quente, a mesma quantidade de calor Q adiciona relativamente pouco ao maior movimento molecular.<\/p>\n<\/div>\n<\/div>\n

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Exemplo: altera\u00e7\u00e3o de entropia no gelo derretido<\/h2>\n

Calcule a\u00a0varia\u00e7\u00e3o na entropia<\/strong>\u00a0de 1 kg de gelo a 0 \u00b0 C, quando derretida reversivelmente em \u00e1gua a 0 \u00b0 C.<\/p>\n

Por se tratar de um processo isot\u00e9rmico, podemos usar:<\/p>\n

\u2206S = S\u00a02<\/sub>\u00a0– S\u00a01<\/sub>\u00a0= Q \/ T<\/strong><\/em><\/p>\n

portanto, a altera\u00e7\u00e3o da entropia ser\u00e1:<\/p>\n

\u2206S = 334 [kJ] \/ 273,15 [K] =\u00a0<\/span>1,22 [kJ \/ K]<\/span><\/strong><\/p>\n

onde s\u00e3o necess\u00e1rios 334 quilojoules de calor para derreter 1 kg de gelo (calor latente de fus\u00e3o = 334 kJ \/ kg) e esse calor \u00e9 transferido para o sistema a 0 \u00b0 C (273,15 K).<\/span><\/p>\n<\/div>\n<\/div>\n

……………………………………………………………………………………………………………………………….<\/p>\n

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":"

Altera\u00e7\u00e3o de entropia – Exemplo.\u00a0Calcule a varia\u00e7\u00e3o na entropia de 1 kg de gelo a 0 \u00b0 C, quando derretida reversivelmente em \u00e1gua a 0 \u00b0 C.\u00a0Por se tratar de um processo isot\u00e9rmico, podemos usar: =S = S2 – S1 = Q \/ T Altera\u00e7\u00e3o de entropia O SI\u00a0unidade de entropia\u00a0\u00e9\u00a0J \/ K\u00a0.\u00a0Segundo Clausius, a … 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 altera\u00e7\u00e3o de entropia - Exemplo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Altera\u00e7\u00e3o de entropia - Exemplo. Calcule a varia\u00e7\u00e3o na entropia de 1 kg de gelo a 0 \u00b0 C, quando derretida reversivelmente em \u00e1gua a 0 \u00b0 C. 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