{"id":234,"date":"2018-05-29T19:24:07","date_gmt":"2018-05-29T17:24:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/lehning\/?p=234"},"modified":"2018-06-09T09:46:10","modified_gmt":"2018-06-09T07:46:10","slug":"quels-poids-portent-ils","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/","title":{"rendered":"Quels poids portent-ils ?"},"content":{"rendered":"<p>Sur les chemins de l\u2019Himalaya, jusqu\u2019\u00e0 5000 m\u00e8tres d\u2019altitude, on rencontre sans cesse des porteurs et porteuses, parfois des enfants, surmont\u00e9s de charges impressionnantes. Comment \u00e9valuer leurs poids\u00a0?<\/p>\n<h2>Compter les canettes<\/h2>\n<p>L&#8217;\u00e9valuation est relativement simple pour les porteurs de caisses de bi\u00e8re : on compte le nombre de canettes. le poids de chacune est facile \u00e0 \u00e9valuer, un peu plus d&#8217;un tiers de kilo. Vingt paquets de dix donnent un fardeau de 70 kilogrammes &#8230; \u00e0 porter sur des milliers de m\u00e8tres de d\u00e9nivel\u00e9e !<\/p>\n<figure id=\"attachment_237\" aria-describedby=\"caption-attachment-237\" style=\"width: 199px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-237 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/HotteColporteur1-199x300.jpg\" alt=\"\" width=\"199\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/HotteColporteur1-199x300.jpg 199w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/HotteColporteur1.jpg 567w\" sizes=\"auto, (max-width: 199px) 100vw, 199px\" \/><figcaption id=\"caption-attachment-237\" class=\"wp-caption-text\">Hotte d&#8217;un colporteur de l&#8217;Himalaya. Elle p\u00e8se environ 70 kg. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a9 Herv\u00e9 Lehning<\/figcaption><\/figure>\n<h2>Evaluer des volumes et des densit\u00e9s<\/h2>\n<p><span style=\"margin: 0px;font-family: 'Arial',sans-serif;font-size: 12pt\"><span style=\"color: #000000\">Quel poids porte cette petite fille de 13 ans rencontr\u00e9e sur le chemin de son village\u00a0?<\/span><\/span><\/p>\n<figure id=\"attachment_238\" aria-describedby=\"caption-attachment-238\" style=\"width: 199px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-238 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/EnfantSherpa7-199x300.jpg\" alt=\"\" width=\"199\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/EnfantSherpa7-199x300.jpg 199w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/EnfantSherpa7.jpg 567w\" sizes=\"auto, (max-width: 199px) 100vw, 199px\" \/><figcaption id=\"caption-attachment-238\" class=\"wp-caption-text\">Fillette de 13 ans, surmont\u00e9e d\u2019un imposant chargement, en route pour Phortse (400 m\u00e8tres plus haut). \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a9 Herv\u00e9 Lehning<\/figcaption><\/figure>\n<p><span style=\"margin: 0px;font-family: 'Arial',sans-serif;font-size: 12pt\"><span style=\"color: #000000\">Elle y transporte des feuilles, que l\u2019on utilise pour transformer le produit des toilettes en compost. La charge correspond malgr\u00e9 tout aux bottes de foin ordinaires qui, press\u00e9es, p\u00e8sent environ 20 kilogrammes. Malgr\u00e9 le c\u00f4t\u00e9 impressionnant de sa charge, il est peu probable que cette jeune fille transporte plus de 10 \u00e0 15 kilogrammes sur son dos. Cela reste important pour une enfant dont la croissance n\u2019est manifestement termin\u00e9e, mais reste comparable aux poids des cartables de certains de nos coll\u00e9giens.<\/span><\/span><\/p>\n<h2>Une buse de fonte<\/h2>\n<figure id=\"attachment_240\" aria-describedby=\"caption-attachment-240\" style=\"width: 199px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-240 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur15-199x300.jpg\" alt=\"\" width=\"199\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur15-199x300.jpg 199w, https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur15.jpg 567w\" sizes=\"auto, (max-width: 199px) 100vw, 199px\" \/><figcaption id=\"caption-attachment-240\" class=\"wp-caption-text\">Buse en fonte sur le chemin de Namch\u00e9 Bazar. \u00a9 Herv\u00e9 Lehning<\/figcaption><\/figure>\n<p><span style=\"margin: 0px;font-family: 'Arial',sans-serif;font-size: 12pt\"><span style=\"color: #000000\">Autrement plus impressionnante est la buse en fonte que transporte cet homme en route vers Namch\u00e9 Bazar. Elle est destin\u00e9e \u00e0 cr\u00e9er une conduite forc\u00e9e, pour servir \u00e0 une micro usine hydro \u00e9lectrique. Le progr\u00e8s vient ici \u00e0 dos d\u2019homme. Quel est le poids de cette buse\u00a0? Il est relativement facile d\u2019\u00e9valuer le volume de fonte. La longueur est de 2,5 m\u00e8tre environ, le diam\u00e8tre 30 centim\u00e8tres et l\u2019\u00e9paisseur 1 centim\u00e8tre. En m\u00e8tres cubes, le volume est donc \u00e9gal \u00e0\u00a0:<\/span><\/span><\/p>\n<p align=\"center\"><span style=\"margin: 0px;font-family: 'Arial',sans-serif;font-size: 12pt\"><span style=\"color: #000000\">2,5\u00a0x\u00a0(0,15<sup><span style=\"font-size: small\">2<\/span><\/sup>\u00a0\u2013\u00a00,14<sup><span style=\"font-size: small\">2<\/span><\/sup>)\u00a0x\u00a03,14<\/span><\/span><\/p>\n<p><span style=\"margin: 0px;font-family: 'Arial',sans-serif;font-size: 12pt\"><span style=\"color: #000000\">soit 0,018 m<sup><span style=\"font-size: small\">3<\/span><\/sup>. La fonte ayant une densit\u00e9 de 7,4 tonnes au m<sup><span style=\"font-size: small\">3<\/span><\/sup>, nous en d\u00e9duisons un poids de 130 kilogrammes environ. M\u00eame si nous admettons une erreur de 20\u00a0% dans notre \u00e9valuation, nous aboutissons \u00e0 un poids sup\u00e9rieur \u00e0 100 kilogrammes, ce qui est impressionnant.<\/span><\/span><\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Sur les chemins de l\u2019Himalaya, jusqu\u2019\u00e0 5000 m\u00e8tres d\u2019altitude, on rencontre sans cesse des porteurs et porteuses, parfois des enfants, surmont\u00e9s de charges impressionnantes. Comment \u00e9valuer leurs poids\u00a0? Compter les canettes L&#8217;\u00e9valuation est relativement simple pour les porteurs de caisses de bi\u00e8re : on compte le nombre de canettes. le poids de chacune est facile &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Quels poids portent-ils ?<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":12,"featured_media":236,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[29,13,15,4,98,10],"tags":[110,26,109,111],"class_list":["post-234","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-maths-2","category-photographies","category-reflexions","category-regard-sur-le-monde","category-viequotidienne","category-voyages","tag-evaluation","tag-himalaya","tag-porteurs","tag-travail"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quels poids portent-ils ?, par Herv\u00e9 Lehning<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quels poids portent-ils ?, par Herv\u00e9 Lehning\" \/>\n<meta property=\"og:description\" content=\"Sur les chemins de l\u2019Himalaya, jusqu\u2019\u00e0 5000 m\u00e8tres d\u2019altitude, on rencontre sans cesse des porteurs et porteuses, parfois des enfants, surmont\u00e9s de charges impressionnantes. Comment \u00e9valuer leurs poids\u00a0? Compter les canettes L&#8217;\u00e9valuation est relativement simple pour les porteurs de caisses de bi\u00e8re : on compte le nombre de canettes. le poids de chacune est facile &hellip; Continuer la lecture de Quels poids portent-ils ? &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\" \/>\n<meta property=\"og:site_name\" content=\"MATH&#039;MONDE, le blog d&#039;Herv\u00e9 LEHNING, agr\u00e9g\u00e9 de math\u00e9matiques\" \/>\n<meta property=\"article:published_time\" content=\"2018-05-29T17:24:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-06-09T07:46:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur6.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"850\" \/>\n\t<meta property=\"og:image:height\" content=\"565\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\",\"name\":\"Quels poids portent-ils ?, par Herv\u00e9 Lehning\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur6.jpg\",\"datePublished\":\"2018-05-29T17:24:07+00:00\",\"dateModified\":\"2018-06-09T07:46:10+00:00\",\"author\":{\"@id\":\"\"},\"breadcrumb\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur6.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2018\/05\/Porteur6.jpg\",\"width\":850,\"height\":565},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2018\/05\/29\/quels-poids-portent-ils\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/blogs.futura-sciences.com\/lehning\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Quels poids portent-ils ?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/\",\"name\":\"MATH&#039;MONDE, le blog d&#039;Herv\u00e9 LEHNING, agr\u00e9g\u00e9 de math\u00e9matiques\",\"description\":\"Comment comprendre le monde moderne sans culture math\u00e9matique ? 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