{"id":5086,"date":"2023-01-30T11:12:33","date_gmt":"2023-01-30T09:12:33","guid":{"rendered":"http:\/\/doctorexpres.ro\/?p=5086"},"modified":"2023-01-30T11:12:43","modified_gmt":"2023-01-30T09:12:43","slug":"de-ce-apa-fierbinte-ingheata-instantaneu","status":"publish","type":"post","link":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/","title":{"rendered":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu?"},"content":{"rendered":"

Probabil c\u0103 ai \u00eencercat \u015fi tu acest experiment. Dac\u0103 arunci o can\u0103 cu ap\u0103 fiart\u0103, pe vreme geroas\u0103, apa nu va c\u0103dea dub form\u0103 de pic\u0103turi, ci se va transforma \u00een particule fine de ghea\u0163\u0103. Nu acela\u015fi lucru se \u00eent\u00eempl\u0103 \u015fi cu apa rece. <\/span><\/span><\/p>\n

E un adev\u0103r, apa fierbinte \u00eenghea\u0163\u0103 mai repede dec\u00eet cea rece. De ce? \u00cenc\u0103 nu se \u015ftie. Dar fenomenul i-a intrigat pe oamenii de \u015ftiin\u0163\u0103 \u00eenc\u0103 din antichitate.
\n<\/span><\/span><\/p>\n

\u00cen era modern\u0103, fenomenul s-a r\u0103sp\u00eendit datorit\u0103 \u015fcolarului\u00a0Mpemba<\/span><\/span> din Tanzania care a observat efectul atunci c\u00eend, prepar\u00eend \u00eenghe\u0163at\u0103, a pus \u00een congelator compozi\u0163ia \u00eenc\u0103 fierbinte. Spre surprinderea tuturor, aceasta a \u00eenghe\u0163at mai repede dec\u00eet de obicei. <\/span><\/span><\/p>\n

Mecanismul efectului r\u0103m\u00eene totu\u015fi necunoscut. \u00cen 2012, Royal Society of Chemistry a lansat o competi\u0163ie \u00een care a propus oamenilor de \u015ftiin\u0163\u0103 s\u0103 afle r\u0103spunsul la aceast\u0103 problem\u0103. Aproximativ 22.000 de lucr\u0103ri au fost primite, dar niciuna care s\u0103 con\u0163in\u0103 o explica\u0163ie satisf\u0103c\u0103toare. Cele mai multe teorii ar\u0103tau c\u0103 apa fierbinte<\/a> se evapor\u0103 mai repede. Pierz\u00eend mas\u0103, se consum\u0103 mai pu\u0163in\u0103 c\u0103ldur\u0103 pentru a ajunge la punctul de \u00eenghe\u0163. Alt\u0103 explica\u0163ie a atins problema curen\u0163ilor de convec\u0163ie. Un pahar cu ap\u0103<\/a> fierbinte se va r\u0103ci mai repede la suprafa\u0163\u0103, accentu\u00eend diferen\u0163a de temperatur\u0103, ceea ce creeaz\u0103 curen\u0163ii de convec\u0163ie. Dar nici aceast\u0103 idee nu a fost verificat\u0103. <\/span><\/span><\/p>\n

O cercetare promi\u0163\u0103toare este efectuat\u0103 de savan\u0163ii de la Southern Methodist University din Dallas \u015fi de la Universitatea Nanjing din China. Descoperirea lor se refer\u0103 la propriet\u0103\u0163ile ciudate ale leg\u0103turii moleculare ale apei: \u201epe m\u0103sur\u0103 ce apa se \u00eenc\u0103lze\u015fte, leg\u0103turile mai slabe se rup \u015fi grupurile de molecule se rearanjeaz\u0103 \u00een structura cristalin\u0103 a ghe\u0163ii<\/a>, acest fenomen fiind un punct de plecare pentru procesul de \u00eenghe\u0163<\/a><\/em>\u201d. Altfel spus, exist\u0103 un procent mai mare de leg\u0103turi moleculare puternice \u00een apa fierbinte dec\u00eet \u00een cea rece, pentru c\u0103 cele slabe au fost eliminate pe m\u0103sura cre\u015fterii temperaturii. <\/span><\/span><\/p>\n

\u00cen ciuda acestor studii, unii exper\u0163i consider\u0103 c\u0103 fenomenul este un mit. O echip\u0103 de la Imperial College London a monitorizat timpul de \u00eenghe\u0163 al apei fierbinte \u015fi pe cel al apei reci \u015fi nu a observat efectul Mpemba. <\/span><\/span><\/p>\n

Articolul integral \u00een descopera.ro<\/a><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Probabil c\u0103 ai \u00eencercat \u015fi tu acest experiment. Dac\u0103 arunci o can\u0103 cu ap\u0103 fiart\u0103, pe vreme geroas\u0103, apa nu<\/p>\n","protected":false},"author":4,"featured_media":5087,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[98,109,6346],"tags":[6531,6532,6530,6533,6534],"class_list":["post-5086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-controverse","category-factori-naturali","category-ianuarie","tag-apa-fierbinte-ingheata","tag-ecanism-efect-mpemba","tag-efect-mpemba","tag-explicatie-mpemba","tag-mpemba"],"yoast_head":"\nDe ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres<\/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:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres\" \/>\n<meta property=\"og:description\" content=\"Probabil c\u0103 ai \u00eencercat \u015fi tu acest experiment. Dac\u0103 arunci o can\u0103 cu ap\u0103 fiart\u0103, pe vreme geroas\u0103, apa nu\" \/>\n<meta property=\"og:url\" content=\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\" \/>\n<meta property=\"og:site_name\" content=\"Doctor Expres\" \/>\n<meta property=\"article:published_time\" content=\"2023-01-30T09:12:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-01-30T09:12:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"459\" \/>\n\t<meta property=\"og:image:height\" content=\"277\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Doctor Expres\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scris de\" \/>\n\t<meta name=\"twitter:data1\" content=\"Doctor Expres\" \/>\n\t<meta name=\"twitter:label2\" content=\"Timp estimat pentru citire\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\"},\"author\":{\"name\":\"Doctor Expres\",\"@id\":\"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076\"},\"headline\":\"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu?\",\"datePublished\":\"2023-01-30T09:12:33+00:00\",\"dateModified\":\"2023-01-30T09:12:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\"},\"wordCount\":409,\"image\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg\",\"keywords\":[\"apa fierbinte ingheata\",\"ecanism efect Mpemba\",\"efect Mpemba\",\"explicatie Mpemba\",\"Mpemba\"],\"articleSection\":[\"Controverse\",\"Factori naturali\",\"Ianuarie\"],\"inLanguage\":\"ro-RO\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\",\"url\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\",\"name\":\"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres\",\"isPartOf\":{\"@id\":\"https:\/\/doctorexpres.ro\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg\",\"datePublished\":\"2023-01-30T09:12:33+00:00\",\"dateModified\":\"2023-01-30T09:12:43+00:00\",\"author\":{\"@id\":\"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076\"},\"breadcrumb\":{\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#breadcrumb\"},\"inLanguage\":\"ro-RO\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ro-RO\",\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage\",\"url\":\"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg\",\"contentUrl\":\"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg\",\"width\":459,\"height\":277},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Prima pagin\u0103\",\"item\":\"https:\/\/doctorexpres.ro\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/doctorexpres.ro\/#website\",\"url\":\"https:\/\/doctorexpres.ro\/\",\"name\":\"Doctor Expres\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/doctorexpres.ro\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ro-RO\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076\",\"name\":\"Doctor Expres\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ro-RO\",\"@id\":\"https:\/\/doctorexpres.ro\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/709aeca982fb42c2713466b8227364d5?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/709aeca982fb42c2713466b8227364d5?s=96&d=mm&r=g\",\"caption\":\"Doctor Expres\"},\"sameAs\":[\"http:\/\/www.doctorexpres.ro\"],\"url\":\"https:\/\/doctorexpres.ro\/index.php\/author\/doctor-expres\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/","og_locale":"ro_RO","og_type":"article","og_title":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres","og_description":"Probabil c\u0103 ai \u00eencercat \u015fi tu acest experiment. Dac\u0103 arunci o can\u0103 cu ap\u0103 fiart\u0103, pe vreme geroas\u0103, apa nu","og_url":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/","og_site_name":"Doctor Expres","article_published_time":"2023-01-30T09:12:33+00:00","article_modified_time":"2023-01-30T09:12:43+00:00","og_image":[{"width":459,"height":277,"url":"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg","type":"image\/jpeg"}],"author":"Doctor Expres","twitter_card":"summary_large_image","twitter_misc":{"Scris de":"Doctor Expres","Timp estimat pentru citire":"2 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#article","isPartOf":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/"},"author":{"name":"Doctor Expres","@id":"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076"},"headline":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu?","datePublished":"2023-01-30T09:12:33+00:00","dateModified":"2023-01-30T09:12:43+00:00","mainEntityOfPage":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/"},"wordCount":409,"image":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage"},"thumbnailUrl":"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg","keywords":["apa fierbinte ingheata","ecanism efect Mpemba","efect Mpemba","explicatie Mpemba","Mpemba"],"articleSection":["Controverse","Factori naturali","Ianuarie"],"inLanguage":"ro-RO"},{"@type":"WebPage","@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/","url":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/","name":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu? - Doctor Expres","isPartOf":{"@id":"https:\/\/doctorexpres.ro\/#website"},"primaryImageOfPage":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage"},"image":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage"},"thumbnailUrl":"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg","datePublished":"2023-01-30T09:12:33+00:00","dateModified":"2023-01-30T09:12:43+00:00","author":{"@id":"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076"},"breadcrumb":{"@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#breadcrumb"},"inLanguage":"ro-RO","potentialAction":[{"@type":"ReadAction","target":["https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/"]}]},{"@type":"ImageObject","inLanguage":"ro-RO","@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#primaryimage","url":"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg","contentUrl":"https:\/\/doctorexpres.ro\/wp-content\/uploads\/2017\/01\/maxresddsdefault.jpg","width":459,"height":277},{"@type":"BreadcrumbList","@id":"https:\/\/doctorexpres.ro\/index.php\/2023\/01\/30\/de-ce-apa-fierbinte-ingheata-instantaneu\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Prima pagin\u0103","item":"https:\/\/doctorexpres.ro\/"},{"@type":"ListItem","position":2,"name":"De ce apa fierbinte \u00eenghea\u0163\u0103 instantaneu?"}]},{"@type":"WebSite","@id":"https:\/\/doctorexpres.ro\/#website","url":"https:\/\/doctorexpres.ro\/","name":"Doctor Expres","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/doctorexpres.ro\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ro-RO"},{"@type":"Person","@id":"https:\/\/doctorexpres.ro\/#\/schema\/person\/28f79c329d023ab5816a649c97121076","name":"Doctor Expres","image":{"@type":"ImageObject","inLanguage":"ro-RO","@id":"https:\/\/doctorexpres.ro\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/709aeca982fb42c2713466b8227364d5?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/709aeca982fb42c2713466b8227364d5?s=96&d=mm&r=g","caption":"Doctor Expres"},"sameAs":["http:\/\/www.doctorexpres.ro"],"url":"https:\/\/doctorexpres.ro\/index.php\/author\/doctor-expres\/"}]}},"_links":{"self":[{"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/posts\/5086","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/comments?post=5086"}],"version-history":[{"count":3,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/posts\/5086\/revisions"}],"predecessor-version":[{"id":8830,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/posts\/5086\/revisions\/8830"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/media\/5087"}],"wp:attachment":[{"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/media?parent=5086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/categories?post=5086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/doctorexpres.ro\/index.php\/wp-json\/wp\/v2\/tags?post=5086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}