{"id":449,"date":"2019-10-15T13:21:44","date_gmt":"2019-10-15T10:21:44","guid":{"rendered":"https:\/\/blog.edu.turku.fi\/scienceed\/?p=449"},"modified":"2019-10-15T13:21:44","modified_gmt":"2019-10-15T10:21:44","slug":"hot-air-balloon-with-a-teabag","status":"publish","type":"post","link":"https:\/\/blog.edu.turku.fi\/scienceed\/2019\/10\/15\/hot-air-balloon-with-a-teabag\/","title":{"rendered":"Hot air balloon with a teabag"},"content":{"rendered":"<blockquote><p><span class=\"tlid-translation translation\" lang=\"en\"><span class=\"\" title=\"\">This is an experiment that you have to be very careful with, as you deal with open fire.<\/span><\/span><\/p><\/blockquote>\n<p><span class=\"tlid-translation translation\" lang=\"en\"><br \/>\n<span class=\"\" title=\"\">Choose a regular tea bag (not a triangular bag).<\/span> <span class=\"\" title=\"\">Cut off the tea bag just below the closure and pour the contents.<\/span> <span title=\"\">Fold up the empty bag to get a long, narrow, hollow cylinder of paper.<\/span> <span class=\"\" title=\"\">The cylinder is placed upright on the ground and the top is lit.<\/span><\/p>\n<p><span class=\"\" title=\"\">What happens is that the fire spreads downwards and when it reaches the lower part of the &#8221;vehicle&#8221; the remains of the bag lift due to the rising hot air.<\/span><\/p>\n<p><span class=\"\" title=\"\">The explanation is that during combustion the surrounding air is heated.<\/span> <span title=\"\">Then the temperature<\/span> <span title=\"\">increases, expands the air and thus gets lower density.<\/span> <span title=\"\">The lower-density hot air rises upward and then gives rise to an airflow.<\/span> <span title=\"\">The tea bag paper is drawn into the air stream as soon as the weight has dropped sufficiently.<\/span> <span class=\"\" title=\"\">The weight decreases as the paper is burned.<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is an experiment that you have to be very careful with, as you deal with open fire. Choose a regular tea bag (not a triangular bag). Cut off the tea bag just below the closure and pour the contents. Fold up the empty bag to get a long, narrow, hollow cylinder of paper. The &hellip; <a href=\"https:\/\/blog.edu.turku.fi\/scienceed\/2019\/10\/15\/hot-air-balloon-with-a-teabag\/\" class=\"more-link\">Forts\u00e4tt l\u00e4sa<span class=\"screen-reader-text\"> \u201dHot air balloon with a teabag\u201d<\/span><\/a><\/p>\n","protected":false},"author":2590,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30020],"tags":[],"class_list":["post-449","post","type-post","status-publish","format-standard","hentry","category-english"],"_links":{"self":[{"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/posts\/449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/users\/2590"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/comments?post=449"}],"version-history":[{"count":1,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/posts\/449\/revisions"}],"predecessor-version":[{"id":450,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/posts\/449\/revisions\/450"}],"wp:attachment":[{"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/media?parent=449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/categories?post=449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.edu.turku.fi\/scienceed\/wp-json\/wp\/v2\/tags?post=449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}