{"id":779,"date":"2017-02-25T15:46:55","date_gmt":"2017-02-25T14:46:55","guid":{"rendered":"https:\/\/www.philix.be\/blog\/?p=779"},"modified":"2019-07-23T11:18:26","modified_gmt":"2019-07-23T09:18:26","slug":"le-sens-du-lavabo","status":"publish","type":"post","link":"https:\/\/www.philix.be\/blog\/2017\/02\/25\/le-sens-du-lavabo\/","title":{"rendered":"Le sens du lavabo"},"content":{"rendered":"

Interpr\u00e9tations erron\u00e9es<\/h2>\n

L’eau du lavabo<\/h3>\n

Contrairement \u00e0 une\u00a0croyance populaire<\/a>, la force de Coriolis due \u00e0 la rotation du\u00a0globe terrestre<\/a>\u00a0est trop faible pour avoir le temps d’influer sur le sens de rotation de l’\u00e9coulement de l’eau\u00a0dans un\u00a0lavabo\u00a0qui se vide. Comme l’ont montr\u00e9 Arsher Shapiro et Lloyd N. Trefethen, pour percevoir une telle influence, il est n\u00e9cessaire d’observer une masse d’eau stabilis\u00e9e dans un tr\u00e8s grand bassin circulaire, d’un diam\u00e8tre de l’ordre d’au moins plusieurs dizaines de kilom\u00e8tres pour un effet en centim\u00e8tres. Dans le siphon d’un lavabo, le sens de rotation de l’eau est d\u00fb \u00e0 la g\u00e9om\u00e9trie du lavabo et aux microcourants d’eau cr\u00e9\u00e9s lors de son remplissage, ou lors d’une agitation de l’eau. Il est donc possible de fausser le r\u00e9sultat en donnant une impulsion \u00e0 l’eau, comme on peut le voir sur certaines vid\u00e9os, o\u00f9 l’exp\u00e9rience est propos\u00e9e aux touristes sur l’\u00e9quateur terrestre.<\/p>\n

Pour calculer la composante horizontale de l’acc\u00e9l\u00e9ration de Coriolis, \u00ab\u00a0a\u00a0\u00bb,\u00a0on utilise cette relation\u00a0:<\/p>\n

<\/p>\n

Avec\u00a0:\u00a0\u00a0: vitesse angulaire du pivotement sid\u00e9ral de la Terre :\u00a0<\/p>\n

\u00a0: le nombre de secondes dans un\u00a0jour sid\u00e9ral. Prenons\u00a0\u00a0<\/p>\n

\u00a0: Vitesse horizontale de l’eau en mouvement. Prenons\u00a0<\/p>\n

\u00a0: Latitude du lieu consid\u00e9r\u00e9. Prenons\u00a0<\/p>\n

On a :<\/h3>\n

<\/p>\n

Soit environ 100\u00a0000 fois moins que l’acc\u00e9l\u00e9ration due \u00e0 la pesanteur\u00a0. Donc le bassin se vide bien avant que la d\u00e9viation due \u00e0 Coriolis se fasse sentir. Une exp\u00e9rience facile \u00e0 reproduire, et qui d\u00e9montre ce point, est pr\u00e9sent\u00e9e \u00e0 ce sujet sur le site de Plan\u00e8te Terre<\/i>. Dans le cas des attractions touristiques mentionn\u00e9es pr\u00e9c\u00e9demment la latitude est nulle, et la composante horizontale de l’acc\u00e9l\u00e9ration de Coriolis \u00e9galement.<\/p>\n

Pour l’anecdote,\u00a0George Gamow<\/a>\u00a0parodia cette id\u00e9e re\u00e7ue en affirmant avoir constat\u00e9 lors d’un voyage en Australie que dans l’h\u00e9misph\u00e8re sud, les vaches ruminent en faisant circuler l’herbe en sens inverse du sens dans l’h\u00e9misph\u00e8re nord.<\/p>\n

Voir aussi :\u00a0http:\/\/www.futura-sciences.com\/planete\/questions-reponses\/meteorologie-sens-tourne-eau-evier-equateur-5974\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Interpr\u00e9tations erron\u00e9es L’eau du lavabo Contrairement \u00e0 une\u00a0croyance populaire, la force de Coriolis due \u00e0 la rotation du\u00a0globe terrestre\u00a0est trop faible pour avoir le temps d’influer sur le sens de rotation de l’\u00e9coulement de l’eau\u00a0dans un\u00a0lavabo\u00a0qui se vide. Comme l’ont montr\u00e9 Arsher Shapiro et Lloyd N. Trefethen, pour percevoir une telle influence, il est n\u00e9cessaire […]<\/p>\n","protected":false},"author":1,"featured_media":784,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[98],"tags":[],"class_list":["post-779","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciences","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"\nLe sens du lavabo - Blog & Roll<\/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.philix.be\/blog\/2017\/02\/25\/le-sens-du-lavabo\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le sens du lavabo - Blog & Roll\" \/>\n<meta property=\"og:description\" content=\"Interpr\u00e9tations erron\u00e9es L’eau du lavabo Contrairement \u00e0 une\u00a0croyance populaire, la force de Coriolis due \u00e0 la rotation du\u00a0globe terrestre\u00a0est trop faible pour avoir le temps d’influer sur le sens de rotation de l’\u00e9coulement de l’eau\u00a0dans un\u00a0lavabo\u00a0qui se vide. 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