{"id":7482,"date":"2020-09-01T20:25:51","date_gmt":"2020-09-02T00:25:51","guid":{"rendered":"https:\/\/cieau.org\/articles\/experiences-scientifiques-sur-la-tension-de-leau\/"},"modified":"2025-04-01T10:37:51","modified_gmt":"2025-04-01T14:37:51","slug":"experiences-scientifiques-sur-la-tension-de-leau","status":"publish","type":"post","link":"https:\/\/www.cieau.org\/en\/articles\/experiences-scientifiques-sur-la-tension-de-leau\/","title":{"rendered":"Exp\u00e9riences scientifiques sur la tension de l&#8217;eau"},"content":{"rendered":"<p>La force de l\u2019eau peut se r\u00e9v\u00e9ler fascinante! \u00a0Amusez-vous avec ces deux exp\u00e9riences afin d\u2019observer et de comprendre la tension de l\u2019eau.<\/p>\n<h2>Exp\u00e9rience 1\u00a0: Un trombone\u00a0dans l\u2019eau<\/h2>\n<h3>Mat\u00e9riel n\u00e9cessaire<\/h3>\n<ul>\n<li>Un verre rempli d\u2019eau\u00a0;<\/li>\n<li>Du savon \u00e0 vaisselle\u00a0;<\/li>\n<li>Du papier absorbant (essuie-tout, mouchoir ou papier toilette)\u00a0;<\/li>\n<li>Un petit trombone en acier.<\/li>\n<\/ul>\n<h3>\u00c9tapes de r\u00e9alisation<\/h3>\n<ol>\n<li>Remplissez un verre d\u2019eau ;<\/li>\n<li>D\u00e9coupez un morceau de papier absorbant de mani\u00e8re \u00e0 ce que votre trombone ne d\u00e9passe pas ;<\/li>\n<li>D\u00e9posez doucement le morceau de papier sur la surface de l\u2019eau. Ensuite, placez d\u00e9licatement le trombone sur le papier ;<\/li>\n<li>Peu \u00e0 peu, le papier se remplit d\u2019eau et commence \u00e0 couler. Vous constaterez que votre trombone flotte ;<\/li>\n<li>Ensuite, versez doucement quelques gouttes\u00a0de savon \u00e0 vaisselle dans le verre. Que constatez-vous ?<\/li>\n<\/ol>\n<h2>Exp\u00e9rience 2\u00a0: Fleurs dans l\u2019eau<\/h2>\n<h3>Mat\u00e9riel n\u00e9cessaire<\/h3>\n<ul>\n<li>Deux verres remplis d\u2019eau ;<\/li>\n<li>Deux petites fleurs\u00a0;<\/li>\n<li>Du savon \u00e0 vaisselle.<\/li>\n<\/ul>\n<h3>\u00c9tapes de r\u00e9alisation<\/h3>\n<ol>\n<li>Remplissez deux verres d\u2019eau ;<\/li>\n<li>M\u00e9langez quelques gouttes de savon \u00e0 vaisselle dans l\u2019un des verres ;<\/li>\n<li>D\u00e9posez une fleur dans chaque verre. Que remarquez-vous ?<\/li>\n<\/ol>\n<h3>Explication\u00a0scientifique<\/h3>\n<p>Dans la premi\u00e8re exp\u00e9rience, l\u2019objet, qui flottait au d\u00e9part est rapidement tomb\u00e9 au fond du verre quand vous avez ajout\u00e9 du savon \u00e0 vaisselle. Pourtant, son poids n\u2019a jamais chang\u00e9. Comment cela est-il possible ?<\/p>\n<p>La\u00a0<strong>flottaison\u00a0<\/strong>ne peut \u00eatre attribu\u00e9e au papier puisqu\u2019il a fini par s\u2019enfoncer dans l\u2019eau et que le trombone flottait toujours. Alors, pourquoi la goutte de savon a-t-elle pr\u00e9cipit\u00e9 la chute rapide du trombone ?<\/p>\n<p>L\u2019eau est compos\u00e9e de minuscules parties, appel\u00e9es\u00a0<strong>mol\u00e9cules<\/strong>, qui aiment se tenir ensemble. Lorsque ces mol\u00e9cules sont pr\u00e8s de la surface, elles cr\u00e9ent en quelque sorte une barri\u00e8re. La tension de cette barri\u00e8re d\u2019eau permet aux mol\u00e9cules de r\u00e9sister plus. C\u2019est cet apport de force appel\u00e9\u00a0<strong>tension superficielle<\/strong>\u00a0qui a permis \u00e0 notre objet de flotter.<\/p>\n<p>Toutefois, le savon poss\u00e8de des mol\u00e9cules qui s\u00e9parent l\u2019eau. Lors de sa pr\u00e9sence dans l\u2019eau, le savon abaisse la tension superficielle. Un d\u00e9s\u00e9quilibre survient et \u00e9loigne l\u2019eau du savon. Cette r\u00e9action cr\u00e9e un mouvement expliquant le changement plut\u00f4t brusque dont vous avez \u00e9t\u00e9 t\u00e9moin en ajoutant le savon dans l\u2019eau. La goutte de savon a dans ce cas-ci\u00a0<strong>chang\u00e9 la force des mol\u00e9cules<\/strong>\u00a0qui ne supportent plus le poids de l\u2019objet. \u00a0Cette r\u00e9action entraine le plongeon de l\u2019objet comme s\u2019il \u00e9tait plus lourd m\u00eame si son poids n\u2019a jamais chang\u00e9 !<\/p>\n<p>La deuxi\u00e8me exp\u00e9rience subit le m\u00eame sort. L\u2019eau remplie de savon a dispers\u00e9e les mol\u00e9cules d\u2019eau ce qui entra\u00eene toute la fleur horizontalement dans l\u2019eau. Les mol\u00e9cules dans le verre ne sont pas assez fortes pour maintenir la fleur hors de l\u2019eau. Cependant, la fleur dans l\u2019eau pure reste verticale. La tension superficielle de l\u2019eau tient les p\u00e9tales sur la surface.<\/p>\n<h3>Pour aller plus loin<\/h3>\n<p>Quand la tension en surface est forte, l\u2019eau en contact avec l\u2019air forme une sph\u00e8re. C\u2019est pour cela que les gouttes d\u2019eau sont sph\u00e9riques. \u00a0Par exemple, si l\u2019eau tombe sur la surface d\u2019une petite feuille verte dans la nature, les forces entre les mol\u00e9cules de la goutte seront plus fortes que celles entre l\u2019eau et la feuille. Une goutte arrondie se formera. Ainsi, la goutte perlera sur la feuille sans s\u2019\u00e9couler. \u00c0 l\u2019inverse, si de l\u2019eau tombe sur un morceau de verre comme sur les pare-brise des voitures, l\u2019attraction entre le verre et l\u2019eau est plus forte qu\u2019entre les mol\u00e9cules d\u2019eau elles-m\u00eames. Au contact de la surface, la goutte d\u2019eau s\u2019\u00e9talera et mouillera l\u2019objet touch\u00e9.<\/p>\n<h3>Les exp\u00e9riences en photos<\/h3>\n<div class=\"media media-element-container media-grand\"><img decoding=\"async\" class=\"media-element file-grand image-style-grand\" title=\"Exp\u00e9rience tension de l'eau fleurs\" src=\"https:\/\/www.cieau.org\/sites\/default\/files\/styles\/grand\/public\/118207842_759885774799392_3013210807955189267_n.jpg?itok=McgboRU4\" alt=\"Exp\u00e9rience tension de l'eau fleurs\" \/><\/div>\n<div class=\"media media-element-container media-grand\"><img decoding=\"async\" class=\"media-element file-grand image-style-grand\" title=\"Exp\u00e9rience tension de l'eau trombone\" src=\"https:\/\/www.cieau.org\/sites\/default\/files\/styles\/grand\/public\/118155119_3213687985366953_144353411955724245_n.jpg?itok=zrHTcaXM\" alt=\"Exp\u00e9rience tension de l'eau trombone\" \/><\/div>\n","protected":false},"excerpt":{"rendered":"<p>La force de l\u2019eau peut se r\u00e9v\u00e9ler fascinante! \u00a0Amusez-vous avec ces deux exp\u00e9riences afin d\u2019observer et de comprendre la tension de l\u2019eau.<\/p>\n","protected":false},"author":13,"featured_media":6243,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[67],"tags":[],"class_list":["post-7482","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scientific-experiments"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Exp\u00e9riences scientifiques sur la tension de l&#039;eau - CI.Eau<\/title>\n<meta name=\"description\" content=\"La force de l\u2019eau peut se r\u00e9v\u00e9ler fascinante! \u00a0Amusez-vous avec ces deux exp\u00e9riences afin d\u2019observer et de comprendre la tension de l\u2019eau.\" \/>\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.cieau.org\/en\/articles\/experiences-scientifiques-sur-la-tension-de-leau\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exp\u00e9riences scientifiques sur la tension de l&#039;eau - CI.Eau\" \/>\n<meta property=\"og:description\" content=\"La force de l\u2019eau peut se r\u00e9v\u00e9ler fascinante! 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