{"id":2152,"date":"2024-10-05T13:57:50","date_gmt":"2024-10-05T11:58:55","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=2152"},"modified":"2024-10-05T13:58:55","modified_gmt":"2024-10-05T11:58:55","slug":"052-propagation-dune-substance-a-la-surface-de-leau","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/052-propagation-dune-substance-a-la-surface-de-leau\/","title":{"rendered":"052 – Propagation d\u2019une substance \u00e0 la surface de l\u2019eau"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Propulsion par recul\u00a0\u00a0<\/strong><\/h2>\n

Liquide vaisselle ou alcool sur l\u2019eau\u00a0\u00a0<\/strong><\/h2>\n

\u00a0<\/span><\/p>\n

Introduction \u00e0: <\/span>\u00a0<\/span><\/h2>\n
    \n
  • Principe du recul\u00a0<\/span>\u00a0<\/span><\/li>\n
  • Tension superficielle\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n[video width=\"1920\" height=\"1080\" mp4=\"https:\/\/experiments.school\/wp-content\/uploads\/2024\/09\/052-video-end.mp4\"][\/video]\n

     <\/p>\n

    Mat\u00e9riel:\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • Panneau de polystyr\u00e8ne (fin, \u00e9paisseur d\u2019environ 2 mm, par exemple dans une bo\u00eete de fast-food) \/ bois clair \/ carton\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Ciseaux \/ couteau bien aiguis\u00e9\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Liquide vaisselle ou d\u00e9tergent liquide \/ d\u00e9sinfectant \/ alcool (par exemple \u00e9thanol, m\u00e9thanol, propanol)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Grand r\u00e9cipient avec de l\u2019eau\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      peut-\u00eatre:\u00a0<\/span>\u00a0<\/span><\/p>\n

        \n
      • une feuille de papier <\/span>\u00a0<\/span><\/li>\n
      • Allumette\u00a0<\/span>\u00a0<\/span><\/li>\n
      • Colle\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Instructions:\u00a0<\/span>\u00a0<\/span><\/h2>\n
          \n
        • D\u00e9coupez une plaque rectangulaire en forme de bateau dans le polystyr\u00e8ne. <\/span>\u00a0<\/span><\/li>\n
        • D\u00e9coupez un canal mince avec un trou au d\u00e9but dans le bateau.\u00a0<\/span>\u00a0<\/span><\/li>\n
        • D\u00e9corez le bateau \u00e0 votre guise avec une petite voile.\u00a0<\/span>\u00a0<\/span><\/li>\n
        • V\u00e9rifiez si le bateau flotte.\u00a0<\/span>\u00a0<\/span><\/li>\n
        • Ajoutez une goutte de savon \u00e0 vaisselle dans le trou.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Observation:\u00a0<\/span>\u00a0<\/span><\/h2>\n
            \n
          • Le bateau commence \u00e0 avancer par \u00e0-coups. <\/span>\u00a0<\/span><\/li>\n<\/ul>\n

            Explication:\u00a0<\/span>\u00a0<\/span><\/h2>\n
              \n
            • Une goutte de savon \u00e0 vaisselle et une goutte d\u2019alcool r\u00e9parties uniform\u00e9ment sur une surface d\u2019eau.\u00a0<\/span>\u00a0<\/span><\/li>\n
            • Les raisons en sont des diff\u00e9rences de densit\u00e9 et de tension superficielle ainsi que l\u2019\u00e9nergie de surface sp\u00e9cifique des substances.\u00a0<\/span>\u00a0<\/span><\/li>\n
            • Le carburant ne peut se r\u00e9pandre vers l\u2019arri\u00e8re que par la fente du bateau, ce qui entra\u00eene une force motrice vers l\u2019avant (force de recul).\u00a0<\/span>\u00a0<\/span><\/li>\n
            • Apr\u00e8s un certain temps, l\u2019alcool se dissout dans l\u2019eau et l\u2019exp\u00e9rience peut \u00eatre refaite. Ce n\u2019est pas le cas avec le liquide vaisselle, o\u00f9 l\u2019exp\u00e9rience ne peut \u00eatre r\u00e9alis\u00e9e qu\u2019une seule fois.<\/span>\u00a0<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":2154,"template":"","meta":[],"product_brand":[],"product_cat":[946,925,896],"product_tag":[],"class_list":{"0":"post-2152","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-15-tension-superficielle-adhesion","7":"product_cat-8-impulsion-conservation-de-limpulsion","8":"product_cat-j-phsik-dans-la-cuisine","9":"","10":"woocommerce-text-align-left","11":"woocommerce-image-align-center","13":"first","14":"instock","15":"shipping-taxable","16":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product\/2152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media\/2154"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media?parent=2152"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_brand?post=2152"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_cat?post=2152"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_tag?post=2152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}