{"id":794,"date":"2012-11-08T13:18:22","date_gmt":"2012-11-08T21:18:22","guid":{"rendered":"http:\/\/otherthings.com\/blog\/?p=794"},"modified":"2024-01-25T13:23:36","modified_gmt":"2024-01-25T21:23:36","slug":"the-coffee-ring-effect","status":"publish","type":"post","link":"https:\/\/otherthings.com\/blog\/2012\/11\/the-coffee-ring-effect\/","title":{"rendered":"The Coffee Ring Effect"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"The Coffee Ring Effect - Intriguing Microscopic Video\" width=\"474\" height=\"356\" src=\"https:\/\/www.youtube.com\/embed\/ZaCGoSTMHyc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Why do coffee stains always have a dark ring around the edge? It&#8217;s because the water&#8217;s surface is curved: it evaporates more quickly near the edges, causing it to flow outward from the middle, carrying coffee particles with it. We cited some early research demonstrating this effect in our 1997 <a href=\"http:\/\/otherthings.com\/uw\/watercolor\/\" target=\"_blank\" rel=\"noopener\">watercolor<\/a> paper, but now there&#8217;s <a href=\"http:\/\/www.youtube.com\/embed\/ZaCGoSTMHyc\" target=\"_blank\" rel=\"noopener\">video<\/a> that actually shows the process happening at a microscopic scale. (Thanks <a href=\"http:\/\/stamen.com\/studio\/eric\" target=\"_blank\" rel=\"noreferrer noopener\">Eric<\/a> for the link!)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why do coffee stains always have a dark ring around the edge? It&#8217;s because the water&#8217;s surface is curved: it evaporates more quickly near the edges, causing it to flow outward from the middle, carrying coffee particles with it. We cited some early research demonstrating this effect in our 1997 watercolor paper, but now there&#8217;s &hellip; <a href=\"https:\/\/otherthings.com\/blog\/2012\/11\/the-coffee-ring-effect\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">The Coffee Ring Effect<\/span> <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":[15],"tags":[116,82,151,117],"class_list":["post-794","post","type-post","status-publish","format-standard","hentry","category-npar","tag-coffee","tag-science","tag-video","tag-watercolor"],"_links":{"self":[{"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/posts\/794","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/comments?post=794"}],"version-history":[{"count":10,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/posts\/794\/revisions"}],"predecessor-version":[{"id":1748,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/posts\/794\/revisions\/1748"}],"wp:attachment":[{"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/media?parent=794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/categories?post=794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/otherthings.com\/blog\/wp-json\/wp\/v2\/tags?post=794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}