{"id":344792,"date":"2016-12-22T03:00:00","date_gmt":"2016-12-22T00:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=ca547170e86bc3c06f3c3f8e869c1c1b"},"modified":"2016-12-22T03:00:00","modified_gmt":"2016-12-22T00:00:00","slug":"experiment-and-mathematical-model-for-the-heat-transfer-in-water-around-4-c-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=344792","title":{"rendered":"Experiment and mathematical model for the heat transfer in water around 4 \u00b0C"},"content":{"rendered":"<p>Water, which is the habitat for a variety of living creatures, has a maximum density at 4.0 \u00b0C. This<br \/>\ncrucial property is considered to play a very important role in the biology of a lake and also has a<br \/>\nclose relationship with the areas of environmentology and geoscience. It would be desirable for<br \/>\nstudents to confirm this important property of water themselves by carrying out simple experiments.<br \/>\nHowever, it is not easy to detect the maximum density at 4.0 \u00b0C because the temperature dependence<br \/>\nof the water density is very small close to its freezing point. For example, the density of water is<br \/>\n0.999 975 g cm \u22123 at 4.0 \u00b0C and 0.999 850 g cm \u22123 at 0.1 \u00b0C. The aim in this manuscript is to<br \/>\ndemonstrate a simple experiment to detect 4.0 \u00b0C as the temperature of maximum density, in which the<br \/>\ntime dependence of the water temperature is measured at several different depths by chilling the<br \/>\nwater surface. This is a simple experiment that can also be performed by high schoo&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Water, which is the habitat for a variety of living creatures, has a maximum density at 4.0 \u00b0C. This<br \/>\ncrucial property is considered to play a very important role in the biology of a lake and also has a<br \/>\nclose relationship with the areas of environmen&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-344792","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/344792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=344792"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/344792\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=344792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=344792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=344792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}