{"id":1291,"date":"2010-01-19T16:25:14","date_gmt":"2010-01-19T15:25:14","guid":{"rendered":"http:\/\/www.proantic.com\/magazine\/?p=1291"},"modified":"2020-06-26T16:39:11","modified_gmt":"2020-06-26T15:39:11","slug":"barometre-selon-torricelli","status":"publish","type":"post","link":"https:\/\/www.proantic.com\/magazine\/barometre-selon-torricelli\/","title":{"rendered":"Le barom\u00e8tre selon Torricelli"},"content":{"rendered":"

L<\/span>e nom de Torricelli (scientifique italien du XVI\u00e8me si\u00e8cle) est rest\u00e9 associ\u00e9 dans l’histoire au premier barom\u00e8tre \u00e0 mercure<\/strong>, cr\u00e9\u00e9 en 1664. C’est en cherchant \u00e0 r\u00e9soudre une interrogation des fontainiers qui ne comprenaient pas pourquoi l’eau ne montait pas au-del\u00e0 d’une certaine hauteur, qu’il a eut l’id\u00e9e lors d’une exp\u00e9rience de remplacer l’eau par du mercure dans un tube de verre.<\/p>\n

\"Barom\u00e8tre<\/a>
Barom\u00e8tre Louis XVI selon Torricelli, 18\u00e8me Si\u00e8cle<\/figcaption><\/figure>\n

C<\/span>‘est en remplissant compl\u00e8tement un tube de mercure, en le bouchant avec le doigt pour emp\u00eacher l’air de rentrer et en le versant dans un bassin lui aussi rempli de mercure, qu’il constate que le tube ne se vide pas compl\u00e8tement dans le bassin mais qu’une colonne de mercure de 76 cm reste dans le tube.<\/p>\n

\"Barom\u00e8tre<\/a>
Barom\u00e8tre Louis XVI selon Torricelli, XVIII\u00e8me<\/figcaption><\/figure>\n

S<\/span>ur la surface du tube s’exercent alors deux forces qui se compensent exactement, le poids de la colonne qui\u00a0 tendrait \u00e0 faire descendre le mercure dans le bassin et la force exerc\u00e9e par l’air qui appuie sur le liquide et qui emp\u00eache la colonne de mercure de se vider, cette force qu’exerce l’air est la pression atmosph\u00e9rique<\/strong>.<\/p>\n

\"M\u00e9canisme<\/a>
M\u00e9canisme de fonctionnement d’un barom\u00e8tre au mercure selon Torricelli.<\/figcaption><\/figure>\n

C<\/span>‘est gr\u00e2ce \u00e0 un m\u00e9canisme selon Torricelli qui se trouve derri\u00e8re le barom\u00e8tres du XVIII\u00e8me si\u00e8cle ci-dessous que celui-ci peut indiquer le temps qu’il fera dans les prochains jours. C’est la pression qu’exerce l’air dans le tube (la pression atmosph\u00e9rique) sur le mercure qui permet de faire actionner l’aiguille de son cadran.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

Le nom de Torricelli (scientifique italien du XVI\u00e8me si\u00e8cle) est rest\u00e9 associ\u00e9 dans l’histoire au premier barom\u00e8tre \u00e0 mercure, cr\u00e9\u00e9 en 1664. C’est en cherchant \u00e0 r\u00e9soudre une interrogation des fontainiers qui ne comprenaient pas pourquoi l’eau ne montait pas au-del\u00e0 d’une certaine hauteur, qu’il a eut l’id\u00e9e lors d’une exp\u00e9rience de remplacer l’eau par […]<\/p>\n","protected":false},"author":6,"featured_media":1295,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[180],"tags":[265,266],"class_list":["post-1291","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arts-decoratifs-proantic","tag-barometre","tag-torricelli"],"yoast_head":"\nLe barom\u00e8tre selon Torricelli Le Magazine de Proantic<\/title>\n<meta name=\"description\" content=\"Le nom de Torricelli (scientifique italien du XVI\u00e8me si\u00e8cle) est rest\u00e9 associ\u00e9 dans l'histoire au premier barom\u00e8tre \u00e0 mercure, cr\u00e9\u00e9 en 1664. 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