{"id":46330,"date":"2019-10-21T23:01:13","date_gmt":"2019-10-21T22:01:13","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quel-est-le-materiau-le-plus-dense-sur-la-terre-definition\/"},"modified":"2020-03-01T09:15:17","modified_gmt":"2020-03-01T08:15:17","slug":"quel-est-le-materiau-le-plus-dense-sur-la-terre-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-materiau-le-plus-dense-sur-la-terre-definition\/","title":{"rendered":"Quel est le mat\u00e9riau le plus dense sur la Terre &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Le mat\u00e9riau le plus dense trouv\u00e9 sur la Terre est le m\u00e9tal osmium, mais sa densit\u00e9 n\u2019a rien \u00e0 envier aux densit\u00e9s d\u2019objets astronomiques exotiques tels que les \u00e9toiles naines blanches et les \u00e9toiles \u00e0 neutrons.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Les mat\u00e9riaux les plus denses sur la Terre<\/h2>\n<p>Puisque les\u00a0<strong>nucl\u00e9ons<\/strong>\u00a0(\u00a0<strong>protons<\/strong>\u00a0et\u00a0<a title=\"Neutron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\"><strong>neutrons<\/strong><\/a>\u00a0) constituent la majeure partie de la masse des atomes ordinaires, la densit\u00e9 de la mati\u00e8re normale a tendance \u00e0 \u00eatre limit\u00e9e par la proximit\u00e9 avec laquelle nous pouvons emballer ces nucl\u00e9ons et d\u00e9pend de la structure atomique interne d&#8217;une substance.\u00a0Le\u00a0<strong>mat\u00e9riau le plus dense<\/strong>\u00a0trouv\u00e9 sur la Terre est le\u00a0<strong>m\u00e9tal osmium<\/strong>\u00a0, mais sa densit\u00e9 n\u2019a rien \u00e0 envier aux densit\u00e9s d\u2019objets astronomiques exotiques tels que\u00a0<strong>les \u00e9toiles naines<\/strong>\u00a0blanches\u00a0et\u00a0<strong>les \u00e9toiles \u00e0 neutrons<\/strong>\u00a0.<\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><strong><span>Liste des mat\u00e9riaux les plus denses:<\/span><\/strong><\/p>\n<ol>\n<li><span>Osmium &#8211; 22,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Iridium &#8211; 22,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Platine &#8211; 21,5 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Rh\u00e9nium &#8211; 21,0 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Plutonium &#8211; 19,8 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Or &#8211; 19,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Tungst\u00e8ne &#8211; 19,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Uranium &#8211; 18,8 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Tantale &#8211; 16,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Mercure &#8211; 13,6 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Rhodium &#8211; 12,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Thorium &#8211; 11,7 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Plomb &#8211; 11,3 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<li><span>Argent &#8211; 10,5 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/li>\n<\/ol>\n<p><span>Il faut noter que le plutonium est un isotope cr\u00e9\u00e9 par\u00a0<\/span><a href=\"https:\/\/www.periodic-table.org\/uranium-periodic-table\/\"><span>l&#8217;<\/span><\/a><span>\u00a0homme et est cr\u00e9\u00e9 \u00e0 partir d&#8217;\u00a0<a href=\"https:\/\/www.periodic-table.org\/uranium-periodic-table\/\">uranium<\/a>\u00a0dans\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\"><span>les r\u00e9acteurs nucl\u00e9aires<\/span><\/a><span>\u00a0.\u00a0Mais, en fait, les scientifiques ont trouv\u00e9 des traces de plutonium naturel.<\/span><\/p>\n<p><span>Si nous incluons les \u00e9l\u00e9ments cr\u00e9\u00e9s par l&#8217;homme, le plus dense jusqu&#8217;\u00e0 pr\u00e9sent est le\u00a0<\/span><strong><span>potassium<\/span><\/strong><span>\u00a0.\u00a0<\/span><strong><span>Le potassium<\/span><\/strong><span>\u00a0est un \u00e9l\u00e9ment chimique avec le symbole\u00a0<\/span><strong><span>Hs<\/span><\/strong><span>\u00a0et le num\u00e9ro atomique 108. C&#8217;est un \u00e9l\u00e9ment synth\u00e9tique (d&#8217;abord synth\u00e9tis\u00e9 \u00e0 Hasse en Allemagne) et radioactif.\u00a0L&#8217;isotope le plus stable connu,\u00a0<\/span><strong><sup><span>269<\/span><\/sup><span>\u00a0Hs<\/span><\/strong><span>\u00a0, a une demi-vie d&#8217;environ 9,7 secondes.\u00a0Sa densit\u00e9 est estim\u00e9e \u00e0\u00a0<\/span><strong><span>40,7 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span>\u00a0.\u00a0La densit\u00e9 du potassium r\u00e9sulte de son\u00a0<\/span><strong><span>poids atomique \u00e9lev\u00e9<\/span><\/strong><span>\u00a0et de la diminution significative\u00a0<\/span><strong><span>des rayons ioniques<\/span><\/strong><span>\u00a0des \u00e9l\u00e9ments de la s\u00e9rie des lanthanides, connue sous le nom de\u00a0<\/span><strong><span>contraction des lanthanides et des actinides<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>La densit\u00e9 du Hassium est suivie du\u00a0<\/span><strong><span>Meitnerium<\/span><\/strong><span>\u00a0(\u00e9l\u00e9ment 109, du nom de la physicienne Lise Meitner), qui a une densit\u00e9 estim\u00e9e \u00e0\u00a0<\/span><strong><span>37,4 x 10\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span> .<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Densit\u00e9 de mati\u00e8re nucl\u00e9aire<\/span><\/h2>\n<p><strong><span>La densit\u00e9 nucl\u00e9aire<\/span><\/strong><span>\u00a0est la densit\u00e9 du noyau d&#8217;un atome.\u00a0C&#8217;est le rapport de la masse par unit\u00e9 de volume \u00e0 l&#8217;int\u00e9rieur du noyau.\u00a0\u00c9tant donn\u00e9 que le noyau atomique porte la majeure partie de la masse de l&#8217;atome et que le noyau atomique est tr\u00e8s petit par rapport \u00e0 l&#8217;atome entier, la densit\u00e9 nucl\u00e9aire est tr\u00e8s \u00e9lev\u00e9e.<\/span><\/p>\n<p><span>La densit\u00e9 nucl\u00e9aire d&#8217;un noyau typique peut \u00eatre approximativement calcul\u00e9e \u00e0 partir de la taille du noyau et de sa masse.\u00a0<\/span><strong><span>Les\u00a0<\/span><a title=\"Rayon nucl\u00e9aire - Rayon du noyau\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/nuclear-radius-radius-of-nucleus\/\"><span>rayons nucl\u00e9aires<\/span><\/a><\/strong><span><strong>\u00a0typiques<\/strong>\u00a0sont de l&#8217;ordre de\u00a0<\/span><strong><span>10 \u00e0\u00a0<\/span><\/strong><strong><sup><span>14<\/span><\/sup><\/strong><strong><span>\u00a0m<\/span><\/strong><span>\u00a0.\u00a0En supposant une forme sph\u00e9rique, les rayons nucl\u00e9aires peuvent \u00eatre calcul\u00e9s selon la formule suivante:<\/span><\/p>\n<p><span>r = r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0.\u00a0A\u00a0<\/span><sup><span>1\/3<\/span><\/sup><\/p>\n<p><span>o\u00f9 r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0= 1,2 x\u00a0<\/span><sup><span>10-15<\/span><\/sup><span>\u00a0m = 1,2 fm<\/span><\/p>\n<p><span>Par exemple,\u00a0<\/span><a title=\"Uranium naturel\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/natural-uranium\/\"><strong><span>l&#8217;uranium naturel se<\/span><\/strong><\/a><span>\u00a0compose principalement de l&#8217;isotope\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><sup><span>238<\/span><\/sup><span>\u00a0U<\/span><\/a><span>\u00a0(99,28%), donc la masse atomique de l&#8217;uranium est proche de la masse atomique de l&#8217;\u00a0isotope\u00a0<\/span><sup><span>238<\/span><\/sup><span>\u00a0U (238.03u).\u00a0Son rayon de ce noyau sera:<\/span><\/p>\n<p><span>r = r\u00a0<\/span><sub><span>0<\/span><\/sub><span>\u00a0.\u00a0A\u00a0<\/span><sup><span>1\/3<\/span><\/sup><span>\u00a0= 7,44 fm.<\/span><\/p>\n<p><span>En supposant qu&#8217;il soit sph\u00e9rique, son volume sera:<\/span><\/p>\n<p><span>V = 4\u03c0r\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0\/3 = 1,73 x 10\u00a0<\/span><sup><span>-42<\/span><\/sup><span>\u00a0m\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0.<\/span><\/p>\n<p><span>La d\u00e9finition habituelle de la densit\u00e9 nucl\u00e9aire donne pour sa densit\u00e9:<\/span><\/p>\n<p><span>\u03c1\u00a0<\/span><sub><span>noyau<\/span><\/sub><span>\u00a0= m \/ V = \u200b\u200b238 x 1,66 x 10\u00a0<\/span><sup><span>-27<\/span><\/sup><span>\u00a0\/ (1,73 x 10\u00a0<\/span><sup><span>-42<\/span><\/sup><span>\u00a0) =\u00a0<\/span><strong><span>2,3 x 10\u00a0<\/span><sup><span>17<\/span><\/sup><span>\u00a0kg \/ m\u00a0<\/span><sup><span>3<\/span><\/sup><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Ainsi, la densit\u00e9 des mati\u00e8res nucl\u00e9aires est plus de 2,10\u00a0<\/span><sup><span>14<\/span><\/sup><span>\u00a0fois sup\u00e9rieure \u00e0 celle de l&#8217;eau.\u00a0C&#8217;est une immense densit\u00e9.\u00a0Le terme descriptif\u00a0<\/span><em><span>densit\u00e9 nucl\u00e9aire<\/span><\/em><span>\u00a0est \u00e9galement appliqu\u00e9 aux situations o\u00f9 des densit\u00e9s similaires se produisent, comme dans les \u00e9toiles \u00e0 neutrons.\u00a0De telles densit\u00e9s immenses se retrouvent \u00e9galement dans les \u00e9toiles \u00e0 neutrons.<\/span><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le mat\u00e9riau le plus dense trouv\u00e9 sur la Terre est le m\u00e9tal osmium, mais sa densit\u00e9 n\u2019a rien \u00e0 envier aux densit\u00e9s d\u2019objets astronomiques exotiques tels que les \u00e9toiles naines blanches et les \u00e9toiles \u00e0 neutrons.\u00a0G\u00e9nie thermique Les mat\u00e9riaux les plus denses sur la Terre Puisque les\u00a0nucl\u00e9ons\u00a0(\u00a0protons\u00a0et\u00a0neutrons\u00a0) constituent la majeure partie de la masse des &#8230; <a title=\"Quel est le mat\u00e9riau le plus dense sur la Terre &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-materiau-le-plus-dense-sur-la-terre-definition\/\" aria-label=\"En savoir plus sur Quel est le mat\u00e9riau le plus dense sur la Terre &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quel est le mat\u00e9riau le plus dense sur la Terre - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Le mat\u00e9riau le plus dense trouv\u00e9 sur la Terre est le m\u00e9tal osmium, mais sa densit\u00e9 est bien inf\u00e9rieure \u00e0 celle des objets astronomiques exotiques tels que les \u00e9toiles naines blanches et les \u00e9toiles \u00e0 neutrons. 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