{"id":1477,"date":"2021-01-30T15:59:00","date_gmt":"2021-01-30T21:59:00","guid":{"rendered":"http:\/\/26television.com\/?p=1477"},"modified":"2021-01-29T20:46:46","modified_gmt":"2021-01-30T02:46:46","slug":"rayos-petrificados","status":"publish","type":"post","link":"https:\/\/26television.com\/?p=1477","title":{"rendered":"Rayos petrificados"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Los rayos son fen??menos atmosf??ricos fascinantes. Su fugacidad hace que verlos acostumbre a ser un peque??o acontecimiento.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/estaticos.muyinteresante.es\/media\/cache\/1140x_thumb\/uploads\/images\/article\/5fd3354fd018720b2f0ef72e\/rayos.jpg\" alt=\"rayos\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sin embargo, se calcula que en la Tierra caen cada d??a alrededor de ocho millones, unos seis mil por minuto. Sus dimensiones son sorprendentes:<strong> los hay de centenares de kil??metros de longitud, pero en promedio miden unos cinco kil??metros de largo y su anchura es de tan solo un cent??metro.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En el experimento de este mes generamos un minirrayo casero para crear fulguritas, estructuras v??treas que surgen cuando una chispa el??ctrica producida por la descarga entre dos nubes o entre una nube y la tierra impacta sobre un suelo arenoso como el de una playa o el desierto. Los rayos alcanzan temperaturas de m??s de 28???000 ??C, as?? que la arena se funde r??pidamente,<strong> y al solidificarse aparece la fulgurita, un tubo vitrificado.<\/strong> El primer descubrimiento documentado de uno de estos objetos corresponde al pastor alem??n David Hermann, que lo hizo<strong> en el a??o 1706<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Un rayo &#8216; light &#8216;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Las fulguritas suelen ser peque??as y alargadas, vitrificadas por dentro, rugosas y ramificadas por los lados.<\/strong> Algunas est??n recorridas por dentro por un canal vac??o. Esta estructura tubular se debe a la expansi??n de los gases que aparecen al calentarse bruscamente la arena. Un rayo descarga de media unos 100???000 voltios y hasta 200???000 amperios. Nosotros ni nos acercamos a estos valores. Para producir la descarga usamos el transformador extra??do y reciclado del interior de un microondas. Con este aparato conseguimos unos 4000 voltios y 0,2 amperios <strong>y una temperatura de unos 2000 ??C, suficiente para fundir la arena.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una vez que est?? todo listo, solo falta ponerse las protecciones de manos y ojos, maximizar las precauciones y esperar a que surjan las<strong> fulgurantes fulguritas.??<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MuyInteresante<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Los rayos son fen??menos atmosf??ricos fascinantes. Su fugacidad hace que verlos acostumbre a ser un peque??o acontecimiento. Sin embargo, se calcula que en la Tierra caen cada d??a alrededor de ocho millones, unos seis mil por minuto. Sus dimensiones son sorprendentes: los hay de centenares de kil??metros de longitud, pero en promedio miden unos cinco [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1478,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,41],"tags":[],"class_list":["post-1477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualidad","category-ciencia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Rayos petrificados - 26 Televisi\u00f3n<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/26television.com\/?p=1477\" \/>\r\n<meta property=\"og:locale\" content=\"es_ES\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Rayos petrificados - 26 Televisi\u00f3n\" \/>\r\n<meta property=\"og:description\" content=\"Los rayos son fen??menos atmosf??ricos fascinantes. Su fugacidad hace que verlos acostumbre a ser un peque??o acontecimiento. Sin embargo, se calcula que en la Tierra caen cada d??a alrededor de ocho millones, unos seis mil por minuto. 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