{"id":20636,"date":"2020-05-01T00:01:34","date_gmt":"2020-05-01T03:01:34","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?p=20636"},"modified":"2020-08-10T15:59:30","modified_gmt":"2020-08-10T18:59:30","slug":"voltametro-de-hofmann","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/","title":{"rendered":"Volt\u00e2metro de Hofmann"},"content":{"rendered":"\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:28% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"516\" height=\"1024\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-516x1024.jpg\" alt class=\"wp-image-20640\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-516x1024.jpg 516w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-151x300.jpg 151w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-768x1524.jpg 768w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-205x407.jpg 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2.jpg 1721w\" sizes=\"auto, (max-width: 516px) 100vw, 516px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">Os vol\u00adt\u00e2\u00adme\u00adtros, ou cou\u00adlom\u00adb\u00ed\u00adme\u00adtros, s\u00e3o ins\u00adtru\u00admen\u00adtos de medida da carga el\u00e9\u00adtrica que cruzou o apa\u00adre\u00adlho. Antes da exis\u00adt\u00ean\u00adcia de ampe\u00adr\u00ed\u00adme\u00adtros, foram muito uti\u00adli\u00adza\u00addos para rea\u00adli\u00adzar medidas el\u00e9\u00adtri\u00adcas. \u00c9 impor\u00adtante ter cuidado para n\u00e3o con\u00adfun\u00addir com os atuais vol\u00adt\u00ed\u00adme\u00adtros, que medem a dife\u00adren\u00e7a de poten\u00adcial el\u00e9\u00adtrico entre dois pontos.<\/p>\n<\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\">\n\n\n\n<h2 class=\"has-text-align-center wp-block-heading\">Funcionamento dos Volt\u00e2metros<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os vol\u00adt\u00e2\u00adme\u00adtros s\u00e3o c\u00e9lulas ele\u00adtro\u00adl\u00ed\u00adti\u00adcas com subs\u00adt\u00e2n\u00adcias conhe\u00adci\u00addas, geral\u00admente prata, cobre ou mer\u00adc\u00fa\u00adrio. Ini\u00adci\u00adal\u00admente, os ele\u00adtro\u00addos (ter\u00admi\u00adnais met\u00e1\u00adli\u00adcos) s\u00e3o pesados e, ap\u00f3s o pro\u00adcesso estu\u00addado, pesados nova\u00admente. A partir da dife\u00adren\u00e7a de massa do c\u00e1todo, \u00e9 cal\u00adcu\u00adlada a quan\u00adti\u00addade de metal depo\u00adsi\u00adtado que, segundo a Lei da Ele\u00adtr\u00f3\u00adlise de Faraday, \u00e9 pro\u00adpor\u00adci\u00ado\u00adnal \u00e0 carga trans\u00admi\u00adtida. Se divi\u00addida pelo tempo de dura\u00e7\u00e3o do pro\u00adcesso, temos a medida indi\u00adreta da cor\u00adrente el\u00e9\u00adtrica no circuito.<\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 37%\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1705\" height=\"1917\" src=\"https:\/\/i0.wp.com\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01.jpg?fit=911%2C1024&amp;ssl=1\" alt class=\"wp-image-20638\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01.jpg 1705w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01-267x300.jpg 267w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01-768x863.jpg 768w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01-911x1024.jpg 911w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/01-205x230.jpg 205w\" sizes=\"auto, (max-width: 1705px) 100vw, 1705px\"><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"has-normal-font-size wp-block-paragraph\"><em><strong>\u00c0 direita: Imagem reti\u00adrada das aulas do curso de qu\u00edmica moderna, minis\u00adtrada por August Wilhelm von Hofmann no Royal College of Che\u00admis\u00adtry, Londres, 1866.<\/strong><\/em><\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">O Vol\u00adt\u00e2\u00adme\u00adtro de Hofmann possui mon\u00adta\u00adgem dife\u00adrente dos vol\u00adt\u00e2\u00adme\u00adtros con\u00adven\u00adci\u00ado\u00adnais. Seus dois tubos cole\u00adto\u00adres s\u00e3o apro\u00adpri\u00ada\u00addos para demons\u00adtra\u00ad\u00e7\u00f5es de este\u00adqui\u00ado\u00adme\u00adtria no pro\u00adcesso de ele\u00adtr\u00f3\u00adlise. Os ele\u00adtro\u00addos deste vol\u00adt\u00e2\u00adme\u00adtro s\u00e3o de platina e a rea\u00e7\u00e3o \u00e9 feita em \u00e1gua uti\u00adli\u00adzando \u00e1cido sul\u00adf\u00fa\u00adrico como cata\u00adli\u00adsa\u00addor, sem depo\u00adsi\u00ad\u00e7\u00e3o de metal no c\u00e1todo. Neste vol\u00adt\u00e2\u00adme\u00adtro, o g\u00e1s formado em cada ele\u00adtrodo \u00e9 apri\u00adsi\u00ado\u00adnado em um tubo sepa\u00adrado, per\u00admi\u00adtindo a com\u00adpa\u00adra\u00ad\u00e7\u00e3o volu\u00adm\u00e9\u00adtrica e pos\u00adte\u00adrior an\u00e1lise de pro\u00adpri\u00ade\u00adda\u00addes dos&nbsp;gases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Apesar de n\u00e3o ter sido desen\u00advol\u00advido para medidas el\u00e9\u00adtri\u00adcas, o Vol\u00adt\u00e2\u00adme\u00adtro de Hofmann tamb\u00e9m foi usado para isso. Ao inv\u00e9s de pesar o metal depo\u00adsi\u00adtado no c\u00e1todo, basta ana\u00adli\u00adsar a quan\u00adti\u00addade de g\u00e1s formada no \u00e2nodo. Para isso, \u00e9 neces\u00ads\u00e1\u00adrio medir o volume de g\u00e1s, assim como a tem\u00adpe\u00adra\u00adtura e a press\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">  Pes\u00adquisa: Gabriel Cury Perrone; F\u00edsico UFRGS \/ Feve\u00adreiro&nbsp;2020&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/www.ufrgs.br\/amlef\/amlef\/amlef322-voltametro-de-hoffman\/\">+ infor\u00adma\u00ad\u00e7\u00f5es<\/a><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os vol\u00adt\u00e2\u00adme\u00adtros, ou cou\u00adlom\u00adb\u00ed\u00adme\u00adtros, s\u00e3o ins\u00adtru\u00admen\u00adtos de medida da carga el\u00e9\u00adtrica que cruzou o apa\u00adre\u00adlho. Antes da exis\u00adt\u00ean\u00adcia de ampe\u00adr\u00ed\u00adme\u00adtros, foram muito uti\u00adli\u00adza\u00addos para rea\u00adli\u00adzar medidas el\u00e9\u00adtri\u00adcas. \u00c9 impor\u00adtante ter cuidado para n\u00e3o con\u00adfun\u00addir com os atuais vol\u00adt\u00ed\u00adme\u00adtros, que medem a dife\u00adren\u00e7a de poten\u00adcial el\u00e9\u00adtrico entre dois pontos. Fun\u00adci\u00ado\u00adna\u00admento dos Vol\u00adt\u00e2\u00adme\u00adtros Os vol\u00adt\u00e2\u00adme\u00adtros s\u00e3o c\u00e9lulas&nbsp;[\u2026]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","wp_typography_post_enhancements_disabled":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[432],"tags":[415],"class_list":["post-20636","post","type-post","status-publish","format-standard","hentry","category-destaques","tag-eletromagnetismo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Volt\u00e2metro de Hofmann - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Volt\u00e2metro de Hofmann - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Os vol\u00adt\u00e2\u00adme\u00adtros, ou cou\u00adlom\u00adb\u00ed\u00adme\u00adtros, s\u00e3o ins\u00adtru\u00admen\u00adtos de medida da carga el\u00e9\u00adtrica que cruzou o apa\u00adre\u00adlho. Antes da exis\u00adt\u00ean\u00adcia de ampe\u00adr\u00ed\u00adme\u00adtros, foram muito uti\u00adli\u00adza\u00addos para rea\u00adli\u00adzar medidas el\u00e9\u00adtri\u00adcas. \u00c9 impor\u00adtante ter cuidado para n\u00e3o con\u00adfun\u00addir com os atuais vol\u00adt\u00ed\u00adme\u00adtros, que medem a dife\u00adren\u00e7a de poten\u00adcial el\u00e9\u00adtrico entre dois pontos. Funcionamento dos Volt\u00e2metros Os vol\u00adt\u00e2\u00adme\u00adtros s\u00e3o c\u00e9lulas [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\" \/>\n<meta property=\"og:site_name\" content=\"Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AMLEF.IF.UFRGS\" \/>\n<meta property=\"article:published_time\" content=\"2020-05-01T03:01:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-08-10T18:59:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-516x1024.jpg\" \/>\n<meta name=\"author\" content=\"Lara Elena Sobreira Gomes\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lara Elena Sobreira Gomes\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\"},\"author\":{\"name\":\"Lara Elena Sobreira Gomes\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/#\/schema\/person\/a719edaa3d1a5c5d55d747e992d11c8b\"},\"headline\":\"Volt\u00e2metro de Hofmann\",\"datePublished\":\"2020-05-01T03:01:34+00:00\",\"dateModified\":\"2020-08-10T18:59:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\"},\"wordCount\":331,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2020\/04\/AMLEF322_2-516x1024.jpg\",\"keywords\":[\"Eletromagnetismo\"],\"articleSection\":[\"Destaques\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\",\"url\":\"https:\/\/www.ufrgs.br\/amlef\/2020\/05\/01\/voltametro-de-hofmann\/\",\"name\":\"Volt\u00e2metro de Hofmann - 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Antes da exis\u00adt\u00ean\u00adcia de ampe\u00adr\u00ed\u00adme\u00adtros, foram muito uti\u00adli\u00adza\u00addos para rea\u00adli\u00adzar medidas el\u00e9\u00adtri\u00adcas. \u00c9 impor\u00adtante ter cuidado para n\u00e3o con\u00adfun\u00addir com os atuais vol\u00adt\u00ed\u00adme\u00adtros, que medem a dife\u00adren\u00e7a de poten\u00adcial el\u00e9\u00adtrico entre dois pontos. 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