{"id":309,"date":"2021-10-29T05:17:49","date_gmt":"2021-10-29T05:17:49","guid":{"rendered":"https:\/\/mariannedyson.com\/blog\/?p=309"},"modified":"2021-10-29T05:17:49","modified_gmt":"2021-10-29T05:17:49","slug":"blue-fire-in-space","status":"publish","type":"post","link":"https:\/\/mariannedyson.com\/blog\/2021\/10\/29\/blue-fire-in-space\/","title":{"rendered":"Blue Fire in Space"},"content":{"rendered":"\n<p><a href=\"http:\/\/www.mariannedyson.com\/\"><strong>Marianne Dyson,<\/strong><\/a><strong> October 2021<\/strong><\/p>\n\n\n\n<p>As the holiday season approaches, many of us decorate our tables with candles. If we did that in space, they would burn round and blue, not pointy and yellow. Why?<\/p>\n\n\n\n<p>Candle flames heat the air around them. The hot air rises because it is less dense and thus weighs less than cold air. This air movement shapes a candle flame into a cone with a point at the top (see photo). Flames are blue at the base where they are hottest, and yellow above because as the hot air rises it takes some of the unburned wax with it in the form of smoke and soot.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/mariannedyson.com\/blog\/wp-content\/uploads\/2021\/10\/2021-CandleFlameWeb-300x300.jpg\" alt=\"\" class=\"wp-image-312 size-medium\" srcset=\"https:\/\/mariannedyson.com\/blog\/wp-content\/uploads\/2021\/10\/2021-CandleFlameWeb-300x300.jpg 300w, https:\/\/mariannedyson.com\/blog\/wp-content\/uploads\/2021\/10\/2021-CandleFlameWeb-150x150.jpg 150w, https:\/\/mariannedyson.com\/blog\/wp-content\/uploads\/2021\/10\/2021-CandleFlameWeb.jpg 679w\" sizes=\"auto, (max-width: 300px) 85vw, 300px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<pre class=\"wp-block-preformatted\"><em>Flames on Earth are cone shaped and blue at the base and yellow at the top because heated air rises. Marianne Dyson photo, 2021.<\/em><\/pre>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<p>In space, hot and cold air weigh the same: nothing. Heated air just expands outward in a sphere. Because the air doesn","protected":false},"excerpt":{"rendered":"<p>Marianne Dyson, October 2021 As the holiday season approaches, many of us decorate our tables with candles. If we did that in space, they would burn round and blue, not pointy and yellow. Why? Candle flames heat the air around them. The hot air rises because it is less dense and thus weighs less than &hellip; <a href=\"https:\/\/mariannedyson.com\/blog\/2021\/10\/29\/blue-fire-in-space\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Blue Fire in Space&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[15,16],"class_list":["post-309","post","type-post","status-publish","format-standard","hentry","category-science-snacks","tag-fire-in-space","tag-flames-in-space"],"_links":{"self":[{"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/posts\/309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/comments?post=309"}],"version-history":[{"count":4,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/posts\/309\/revisions"}],"predecessor-version":[{"id":318,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/posts\/309\/revisions\/318"}],"wp:attachment":[{"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/media?parent=309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/categories?post=309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mariannedyson.com\/blog\/wp-json\/wp\/v2\/tags?post=309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}