{"id":758,"date":"2018-02-10T12:32:55","date_gmt":"2018-02-10T11:32:55","guid":{"rendered":"http:\/\/anticopedie.fr\/WordPress\/?p=758"},"modified":"2018-02-11T12:29:18","modified_gmt":"2018-02-11T11:29:18","slug":"faciles-nos-systemes-dunites","status":"publish","type":"post","link":"https:\/\/anticopedie.fr\/WordPress\/?p=758","title":{"rendered":"Trop faciles, nos syst\u00e8mes d&rsquo;unit\u00e9s ?"},"content":{"rendered":"<p>Heureuse \u00e9poque o\u00f9, sans se poser de question, chacun peut acheter un kilo de fruits \u00e0 Paris, \u00e0 Rome ou \u00e0 Ath\u00e8nes et le payer en euros.<br \/>\nTel n\u2019\u00e9tait \u00e9videmment pas le cas dans l\u2019Antiquit\u00e9 (voyez notre article), et il est m\u00eame inutile de remonter si loin!<\/p>\n<p>Pour commencer, le joailler compte toujours en carats (0,2 gramme), le bijoutier suit le cours de l\u2019or en onces alors que le p\u00e9trole se cote en barils (pour m\u00e9moire, un baril \u00e9quivaut \u00e0 42 gallons de vin anglais). Quant \u00e0 la diagonale de votre \u00e9cran, elle se mesure en pouces.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-759\" src=\"http:\/\/anticopedie.fr\/WordPress\/wp-content\/uploads\/2018\/01\/chope.gif\" alt=\"Une pinte, une chope, un demi?\" width=\"83\" height=\"100\" \/>Jusqu\u2019en 1971, l\u2019achat d\u2019une pinte de bi\u00e8re en Angleterre (0,568 litre) se r\u00e9glait en shillings valant 12 pence ou 1\/20\u00e8me de livre. Le touriste se demandait combien co\u00fbtait un \u00ab\u00a0demi\u00a0\u00bb de bi\u00e8re (qui d\u2019ailleurs ne fait qu\u2019un quart de litre) en francs fran\u00e7ais. Et il se demande toujours combien co\u00fbte le litre d\u2019essence aux Etats-Unis (environ 2 dollars pour un gallon qui vaut, comme chacun sait, 231 pouces cubes et n\u2019a rien \u00e0 voir avec le gallon britannique de 160 onces liquides).<\/p>\n<p>Chez nous, c\u2019est dans le bouillonnement de la R\u00e9volution Fran\u00e7aise que le syst\u00e8me m\u00e9trique d\u00e9cimal est institu\u00e9 le 18 germinal an III (7 avril 1795), venant remplacer les centaines d\u2019unit\u00e9s de mesure alors en usage. Auparavant, tout changeait d\u2019une province \u00e0 l\u2019autre, voire d\u2019une ville \u00e0 l\u2019autre.<\/p>\n<p>M\u00eame autour de Paris, les arpenteurs mesuraient les terrains en perches qui valaient 18 pieds \u00e0 Rosny-sous-Bois, 19 pieds et 4 pouces \u00e0 Montreuil et 20 pieds \u00e0 Noisy-le-Sec. La livre de Paris comptait 16 onces (de 30,6 grammes), celle de Lyon 13 onces 3\/4&#8230; mais 15 onces pour la soie. Car les unit\u00e9s d\u00e9pendaient parfois aussi du produit pes\u00e9.<\/p>\n<p>Il existait par exemple huit livres diff\u00e9rentes \u00e0 Venise. Cinq servaient, dans la ville, \u00e0 peser les m\u00e9dicaments, les fils tiss\u00e9s d&rsquo;or et d&rsquo;argent, la soie, les farines, le pain. Trois autres servaient aux \u00e9changes commerciaux: le marc (238,531g), la livre \u00ab\u00a0<em>sottile<\/em>\u00a0\u00bb<br \/>\n(l\u00e9g\u00e8re, 301g) pour les produits rares et co\u00fbteux comme les \u00e9pices, la livre \u00ab\u00a0<em>grossa<\/em>\u00a0\u00bb (lourde, 477g) pour les autres. Bien s\u00fbr, chacune poss\u00e9dait ses propres sous-multiples qui \u00e9taient tout sauf d\u00e9cimaux.<\/p>\n<p>Consid\u00e9rez aussi que, jusqu\u2019au 13e si\u00e8cle, vous deviez effectuer les calculs de conversion en chiffres romains.<br \/>\nCe qui n\u2019a jamais d\u00e9courag\u00e9 les voyageurs&#8230;<\/p>\n<p style=\"text-align: right;\"><strong>Ren\u00e9 Kauffmann<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aujourd&rsquo;hui, les unit\u00e9s de longueur et de poids vous semblent faciles \u00e0 manier ? Ce n&rsquo;\u00e9tait pas le cas dans l\u2019Antiquit\u00e9, et m\u00eame aujourd&rsquo;hui, tout n&rsquo;est pas simple&#8230;<br \/>\n <a href=\"https:\/\/anticopedie.fr\/WordPress\/?p=758\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[473,99,166,470,476],"class_list":["post-758","post","type-post","status-publish","format-standard","hentry","category-editos","tag-conversion","tag-equivalence","tag-mesure","tag-poids","tag-unites"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trop faciles, nos syst\u00e8mes d&#039;unit\u00e9s ? - AnticoP\u00e9die: le blog<\/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:\/\/anticopedie.fr\/WordPress\/?p=758\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trop faciles, nos syst\u00e8mes d&#039;unit\u00e9s ? - AnticoP\u00e9die: le blog\" \/>\n<meta property=\"og:description\" content=\"Aujourd&#039;hui, les unit\u00e9s de longueur et de poids vous semblent faciles \u00e0 manier ? 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