{"id":3218,"date":"2026-10-11T17:24:39","date_gmt":"2026-10-11T04:24:39","guid":{"rendered":"https:\/\/iypt.org.nz\/?page_id=3218"},"modified":"2026-10-12T21:28:02","modified_gmt":"2026-10-12T08:28:02","slug":"problem-6-air-vortex","status":"publish","type":"page","link":"https:\/\/iypt.org.nz\/?page_id=3218","title":{"rendered":"Problem 6: Air Vortex"},"content":{"rendered":"\n<p class=\"has-text-align-center has-x-large-font-size wp-block-paragraph\">When does spinning a magnet in a jar of water produce a thin tube of air that reaches all the way down to the bottom of the jar?<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Problem in full<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is problem 10 of 17 for IYPT 2027<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>&#8220;Place a small rod-shaped magnet on the bottom of a vessel filled with liquid and set it into rotation using a magnetic stirrer. Above a certain rotation speed, a thin air channel forms, extending from the liquid surface down to the rotating magnet itself. Investigate and explain this phenomenon.&#8221;<\/em><\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Specialist equipment<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A magnetic stirrer as used in school science labs. These consist of a consisting of a rod shaped magnet that goes in a container of liquid, and an electronic baseplate that the container sits on. It is possible to make your own &#8211; but that isn&#8217;t the point of the experiment.<\/li>\n\n\n\n<li>A clear sided jar so you can see the vortex form.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Safety first!<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are no specific safety concerns with this experiment, however the type and state of the liquid used may require special care. Consider this in your safety plan.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When does spinning a magnet in a jar of water produce a thin tube of air that reaches all the way down to the bottom of the jar? Problem in full This is problem 10 of 17 for IYPT 2027 &#8220;Place a small rod-shaped magnet on the bottom of a vessel filled with liquid and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3246,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3218","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/3218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iypt.org.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3218"}],"version-history":[{"count":6,"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/3218\/revisions"}],"predecessor-version":[{"id":3322,"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/pages\/3218\/revisions\/3322"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iypt.org.nz\/index.php?rest_route=\/wp\/v2\/media\/3246"}],"wp:attachment":[{"href":"https:\/\/iypt.org.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}