{"id":33563,"date":"2022-12-20T23:00:00","date_gmt":"2022-12-20T23:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/cameroun\/?p=33563"},"modified":"2022-12-20T23:00:00","modified_gmt":"2022-12-20T23:00:00","slug":"pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond","title":{"rendered":"Pourquoi est-il important de baisser le couvercle des toilettes ? Une exp\u00e9rience scientifique r\u00e9pond"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Cameroun. <\/strong><\/span>Voici pourquoi il est essentiel de rabaisser le couvercle sur la lunette des toilettes avant de tirer la chasse. Aux Etats-Unis, des chercheurs se sont amuse\u0301s a\u0300 observer au laser la propagation des gouttelettes lors de l&rsquo;e\u0301vacuation du contenu de la cuvette. Surpris, ils enregistrent de ve\u0301ritables panaches d&rsquo;ae\u0301rosols jusqu&rsquo;au plafond de leur laboratoire pouvant, en conditions re\u0301elles, e\u0302tre porteurs de virus et bacte\u0301ries.<\/p>\n<p><b>Deux lasers pointe\u0301s sur une cuvette<\/b><\/p>\n<p>\u00ab\u00a0Lorsque la chasse d&rsquo;eau est tire\u0301e, elle e\u0301met de tre\u0300s petites particules en ae\u0301rosol, de l&rsquo;ordre de 10 microme\u0300tres a\u0300 pre\u0300s d&rsquo;un millime\u0300tre. Les tre\u0300s grosses particules tombent rapidement. Les plus petites particules restent en suspension\u00a0\u00bb, expose John Crimaldi, professeur en inge\u0301nierie civile, environnementale et architecturale a\u0300 l&rsquo;Universite\u0301 du Colorado (Etats-Unis), qui a dirige\u0301 ces travaux publie\u0301s dans Scientific Reports. Mais jusqu&rsquo;a\u0300 pre\u0301sent, nul n&rsquo;avait e\u0301tudie\u0301 la propagation de ces particules en ae\u0301rosols. C&rsquo;est maintenant chose faite, gra\u0302ce a\u0300 deux puissants lasers installe\u0301s au-dessus d&rsquo;une cuvette tro\u0302nant au milieu de leur laboratoire. Le premier laser pointait en permanence sur les toilettes pour re\u0301ve\u0301ler la position des particules en suspension, tandis que l&rsquo;autre envoyait des impulsions lumineuses rapides pour mesurer leur vitesse et leur direction. Deux came\u0301ras a\u0300 haute re\u0301solution ont enregistre\u0301 les images de ce diaporama.<\/p>\n<p><b>Jusqu&rsquo;au plafond du laboratoire<\/b><\/p>\n<p>\u00ab\u00a0Ces panaches ae\u0301rosolise\u0301s qui sont e\u0301jecte\u0301s par les chasses d&rsquo;eau sont incroyablement e\u0301nergiques, mais aussi tre\u0300s instables et chaotiques. Ils transportent des particules tre\u0300s rapidement jusqu&rsquo;au plafond de notre laboratoire\u00a0\u00bb, rapporte John Crimaldi. Les particules d&rsquo;eau en suspension dans l&rsquo;air atteignent les 2 me\u0300tres par seconde, principalement en direction du plafond et du mur arrie\u0300re, selon une trajectoire cependant impre\u0301visible. Une fois le plafond du laboratoire atteint, les gouttelettes se sont re\u0301pandues vers l&rsquo;avant, dans le reste de la pie\u0300ce.<\/p>\n<p><b>Un moteur de propagation des virus et bacte\u0301ries<\/b><\/p>\n<p>Si dans l&rsquo;expe\u0301rience la cuvette ne contenait que de l&rsquo;eau du robinet, dans la vraie vie de nombreuses e\u0301tudes ont montre\u0301 que les agents pathoge\u0300nes persistent dans la cuvette pendant des dizaines de chasses d&rsquo;eau. Il y a donc un enjeu \u00ab\u00a0de sante\u0301 publique\u00a0\u00bb, souligne John Crimaldi, les gouttelettes e\u0301tant de potentiels transporteurs de virus et bacte\u0301ries comme Escherichia Coli ou des norovirus. Le virus du Covid-19 pourrait the\u0301oriquement e\u0302tre concerne\u0301, mais cela reste a\u0300 de\u0301montrer. Or, alors que les plus grosses ont tendance a\u0300 se de\u0301poser sur les surfaces, les ae\u0301rosols de moins de quelques microme\u0300tres peuvent non seulement rester en suspension pendant plusieurs minutes, mais e\u0301galement passer au travers des poils du nez et pe\u0301ne\u0301trer dans les poumons. \u00ab\u00a0Ces re\u0301sultats donnent a\u0300 l&rsquo;industrie et aux scientifiques la possibilite\u0301 d&rsquo;apporter des changements a\u0300 la fac\u0327on dont les toilettes publiques sont conc\u0327ues du point de vue de la de\u0301sinfection, de la ventilation et me\u0302me de la conception des toilettes, pour essayer de re\u0301duire cette exposition\u00a0\u00bb, conclut John Crimaldi.\r\n                <style type=\"text\/css\">\r\n                    \r\n                    #td_uid_1_69d35cc79e536  .td-doubleSlider-2 .td-item1 {\r\n                        background: url(https:\/\/static.africa-press.net\/cameroun\/sites\/57\/2022\/12\/postMediaimg_4_1-80x60.jpg) 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Voici pourquoi il est essentiel de rabaisser le couvercle sur la lunette des toilettes avant de tirer la chasse. Aux Etats-Unis, des chercheurs se sont amuse\u0301s a\u0300 observer au laser la propagation des gouttelettes lors de l&rsquo;e\u0301vacuation du contenu de la cuvette. Surpris, ils enregistrent de ve\u0301ritables panaches d&rsquo;ae\u0301rosols jusqu&rsquo;au plafond de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":33562,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-33563","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cameroun","tag-cameroun"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Pourquoi est-il important de baisser le couvercle des toilettes ? Une exp\u00e9rience scientifique r\u00e9pond - Cameroun<\/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.africa-press.net\/cameroun\/toutes-les-actualites\/pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pourquoi est-il important de baisser le couvercle des toilettes ? Une exp\u00e9rience scientifique r\u00e9pond\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Cameroun. Voici pourquoi il est essentiel de rabaisser le couvercle sur la lunette des toilettes avant de tirer la chasse. Aux Etats-Unis, des chercheurs se sont amuse\u0301s a\u0300 observer au laser la propagation des gouttelettes lors de l&rsquo;e\u0301vacuation du contenu de la cuvette. Surpris, ils enregistrent de ve\u0301ritables panaches d&rsquo;ae\u0301rosols jusqu&rsquo;au plafond de [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond\" \/>\n<meta property=\"og:site_name\" content=\"Cameroun\" \/>\n<meta property=\"article:published_time\" content=\"2022-12-20T23:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cameroun\/sites\/57\/2022\/12\/postQueueImg_1671549617.90.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"750\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/pourquoi-est-il-important-de-baisser-le-couvercle-des-toilettes-une-experience-scientifique-repond\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Pourquoi est-il important de baisser le couvercle des toilettes ? 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