{"id":196,"date":"2005-02-02T17:50:56","date_gmt":"2005-02-02T17:50:56","guid":{"rendered":"http:\/\/informacyde.com\/blog\/?p=196"},"modified":"2008-08-08T16:35:29","modified_gmt":"2008-08-08T14:35:29","slug":"pourquoi-le-ciel-est-il-bleu","status":"publish","type":"post","link":"https:\/\/www.informacyde.com\/blog\/divers\/pourquoi-le-ciel-est-il-bleu\/","title":{"rendered":"Pourquoi le ciel est-il bleu ?"},"content":{"rendered":"

C’est une question peut-\u00eatre un peu futile pour certains, mais je me la suis pos\u00e9 quelquefois, alors autant vous faire part de ce que j’ai d\u00e9couvert :<\/p>\n

La lumi\u00e8re en provenance du Soleil est compos\u00e9e de plusieurs couleurs, chacune poss\u00e9dant une longueur d’onde diff\u00e9rente. Lorsqu’elle traverse l’atmosph\u00e8re, cette lumi\u00e8re entre en collision avec des mol\u00e9cules gazeuses et diverses particules en suspension. Certaines ondes lumineuses sont alors \u00e9parpill\u00e9es dans toutes les directions. Ce ph\u00e9nom\u00e8ne est appel\u00e9 \u00ab diffusion Rayleigh \u00bb, en l’honneur du math\u00e9maticien et physicien anglais John William Strutt Rayleigh (1842-1919).<\/p>\n

Les diff\u00e9rentes longueurs d’ondes de la lumi\u00e8re ne sont pas affect\u00e9es de la m\u00eame mani\u00e8re par ce ph\u00e9nom\u00e8ne. Les longueurs d’ondes plus courtes – comme le bleu (0,4 \u00b5m) – sont plus facilement diffus\u00e9es que les autres couleurs – comme le jaune (0,6 \u00b5m) ou le rouge (0,8 \u00b5m). Par cons\u00e9quent, le ciel nous para\u00eet bleu.<\/p>\n

(source : Cyberscience.com<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"

C’est une question peut-\u00eatre un peu futile pour certains, mais je me la suis pos\u00e9 quelquefois, alors autant vous faire part de ce que j’ai d\u00e9couvert : La lumi\u00e8re en provenance…<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-196","post","type-post","status-publish","format-standard","hentry","category-divers"],"yoast_head":"\nPourquoi le ciel est-il bleu ? - Informacyde<\/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:\/\/www.informacyde.com\/blog\/divers\/pourquoi-le-ciel-est-il-bleu\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pourquoi le ciel est-il bleu ? 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