{"id":1902,"date":"2024-06-08T13:23:23","date_gmt":"2024-06-08T11:22:09","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1902"},"modified":"2024-06-08T13:22:10","modified_gmt":"2024-06-08T11:22:10","slug":"177-lair-chaud-monte","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/177-lair-chaud-monte\/","title":{"rendered":"177 \u2013 L\u2019air chaud monte\u00a0"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

L\u2019air plus chaud p\u00e8se moins que l\u2019air plus froid\u00a0\u00a0<\/strong><\/h2>\n

Principe<\/span> d\u2019une<\/span> montgolfi\u00e8re<\/span>\u00a0<\/span><\/strong><\/h2>\n

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

Introduction \u00e0: <\/span>\u00a0<\/span><\/h2>\n
    \n
  • Dilatation des gaz lorsqu\u2019ils sont chauff\u00e9s\u00a0<\/span>\u00a0<\/span><\/li>\n
  • \u00c9quation d\u2019\u00e9tat des gaz parfaits\u00a0<\/span>\u00a0<\/span><\/li>\n
  • Flottabilit\u00e9 dans les gaz\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    https:\/\/experiments.school\/wp-content\/uploads\/2024\/06\/177-video-end-online-video-cutter.com_.mp4<\/p>\n

    Mat\u00e9riel:\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • R\u00e9cipient sous forme d\u2019empreinte (environ 1\/2 l, par exemple bouteille en plastique, verre \u00e0 boire)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Feuille d\u2019aluminium, env. 1\/2 m\u00a0<\/span>\u00a0<\/span><\/li>\n
    • \u00c9lastique\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Ruban adh\u00e9sif\u00a0<\/span>\u00a0<\/span><\/li>\n
    • R\u00e8gle (environ 30 cm de long)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Goupille (cylindrique, sans bords)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Blocs d\u2019\u00e9dition (blocs en bois (mat\u00e9riau cubo\u00efde, dur, lisse) ou pi\u00e8ces de monnaie, hauteur env. 2,5 cm)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Poids \/ pi\u00e8ces de masse pour \u00e9quilibrer la balance (par exemple, \u00e9crous \u00e0 vis, plusieurs pi\u00e8ces de monnaie)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Bougie\u00a0\u00a0<\/span>\u00a0<\/span><\/li>\n
    • Briquet \/ Match<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Montage:<\/span>\u00a0<\/span><\/h2>\n

      Cylindre en aluminium :\u00a0<\/span>\u00a0<\/span><\/p>\n

        \n
      • Mettez le papier d\u2019aluminium sur le r\u00e9cipient et utilisez-le pour faire un cylindre creux d\u2019un volume d\u2019environ un demi-litre\u00a0<\/span>\u00a0<\/span><\/li>\n
      • Fixez-y l\u2019anneau en caoutchouc avec du ruban adh\u00e9sif\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        \u00c9chelle de la r\u00e8gle :\u00a0<\/span>\u00a0<\/span><\/p>\n

          \n
        • Fixez le stylo \u00e0 la r\u00e8gle avec le ruban adh\u00e9sif, \u00e0 environ un tiers de la longueur\u00a0<\/span>\u00a0<\/span><\/li>\n
        • Placez l\u2019\u00e9chelle de la r\u00e8gle sur les blocs de support sur le bord d\u2019une table et accrochez l\u2019anneau en caoutchouc avec le cylindre en aluminium sur l\u2019extr\u00e9mit\u00e9 la plus longue de la r\u00e8gle. Le cylindre en aluminium doit pouvoir se balancer librement \u00e0 c\u00f4t\u00e9 du bord de la table.\u00a0<\/span>\u00a0<\/span><\/li>\n
        • Tarez la r\u00e8gle \u00e0 l\u2019aide des poids de sorte que le cylindre en aluminium n\u2019ait qu\u2019un l\u00e9ger surpoids minime.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Ex\u00e9cution:<\/span>\u00a0<\/span><\/h2>\n
            \n
          • Tenez la flamme de la bougie sous l\u2019ouverture du cylindre en aluminium.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

            Observation:\u00a0<\/span>\u00a0<\/span><\/h2>\n
              \n
            • Les \u00e9cailles se d\u00e9vissent, c\u2019est-\u00e0-dire que le cylindre en aluminium se d\u00e9place vers le haut.\u00a0<\/span>\u00a0<\/span><\/li>\n
            • Si vous enlevez \u00e0 nouveau la flamme, l\u2019\u00e9ruption cutan\u00e9e diminue.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

              Conseil:<\/span>\u00a0<\/span><\/h2>\n
                \n
              • Pour v\u00e9rifier, accrochez le cylindre en aluminium avec l\u2019ouverture vers le haut sur l\u2019\u00e9chelle de la r\u00e8gle, cette fois l\u2019\u00e9chelle ne d\u00e9vie pas.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                Explication:\u00a0<\/span>\u00a0<\/span><\/h2>\n
                  \n
                • L\u2019air chaud dans le cylindre a une densit\u00e9 inf\u00e9rieure \u00e0 celle de l\u2019air environnant, de sorte que le cylindre subit une portance.\u00a0<\/span>\u00a0<\/span><\/li>\n
                • L\u2019air chaud dans le cylindre contient moins de particules que l\u2019air plus froid qui s\u2019y trouvait en premier. Il p\u00e8se donc moins.\u00a0<\/span>\u00a0<\/span><\/li>\n
                • Dans l\u2019\u00e9quation d\u2019\u00e9tat des gaz parfaits pV = NkT ce qui s\u2019applique \u00e9galement approximativement \u00e0 l\u2019air, la pression p et le volume V sont constants. Ainsi, la temp\u00e9rature absolue T est indirectement proportionnelle au nombre de particules N.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":1903,"template":"","meta":[],"product_brand":[],"product_cat":[907,908,699,887],"product_tag":[],"class_list":{"0":"post-1902","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-2-force-equilibre-des-forces","7":"product_cat-3-pression-poussee-darchimede","8":"product_cat-a-mecanique","9":"product_cat-d-theorie-de-la-chaleur-fr","10":"","11":"woocommerce-text-align-left","12":"woocommerce-image-align-center","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product\/1902","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\/1903"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media?parent=1902"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_brand?post=1902"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_cat?post=1902"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_tag?post=1902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}