{"id":972,"date":"2010-12-30T11:03:00","date_gmt":"2010-12-30T08:03:00","guid":{"rendered":"https:\/\/arugrupp.rktv.ee\/?p=972"},"modified":"2023-07-19T11:05:25","modified_gmt":"2023-07-19T08:05:25","slug":"if-windows-turn-foggy","status":"publish","type":"post","link":"https:\/\/arugrupp.rktv.ee\/en\/if-windows-turn-foggy\/","title":{"rendered":"If windows turn foggy"},"content":{"rendered":"\n<p>In cold weather even very good windows can fog up if the excessive humidity does not get out of the room in any other way.<\/p>\n\n\n\n<p>In wintertime, a normal heated 20 m<sup>2<\/sup>&nbsp;room has 300-400 g of water in the air (see chart \u2013 light blue area on the right). At about 7\u00b0C the 400 g of water does not fit in the air anymore (light blue area on the left) and starts to condense on the coolest surface. In a house that has been properly built, this surface is the window. If the heater room air contains 500 g of water (dark blue area on the right), the condensation starts already at 11\u00b0C. At -10\u00b0C, every window, even the most modern one with a high thermal resistance, will have some places in the room below 11\u00b0C.<\/p>\n\n\n\n<p><strong>In wintertime, even 150 g of excessive water in the air of a 20 m<sup>2<\/sup>&nbsp;room will make any window fog up. This amount of water is easy to accumulate in a badly ventilated room:<\/strong>&nbsp;a human breathes out 250 g of water in one night, the watering can has 500 g and laundry that has been hanged to dry more than one kilogram of water.<\/p>\n\n\n\n<p>In the below chart it is shown how much water there is in the air of a 20 m<sup>2<\/sup>&nbsp;room.<\/p>\n\n\n\n<p>Table header translation: [Room temperature \/Grams of water in the air of a 20 m<sup>2<\/sup>\u00a0room at relative humidity]<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"576\" height=\"506\" src=\"https:\/\/arugrupp.rktv.ee\/wp-content\/uploads\/2023\/07\/higistavadaknad-1.jpg\" alt=\"\" class=\"wp-image-973\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"In cold weather even very good windows can fog up if the excessive humidity does not get out of the room in any other way. In wintertime, a normal heated 20 m2&nbsp;room has 300-400 g of water in the air (see chart \u2013 light blue area on the right). At about 7\u00b0C the 400 g [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/posts\/972"}],"collection":[{"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/comments?post=972"}],"version-history":[{"count":1,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/posts\/972\/revisions"}],"predecessor-version":[{"id":976,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/posts\/972\/revisions\/976"}],"wp:attachment":[{"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/media?parent=972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/categories?post=972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arugrupp.rktv.ee\/en\/wp-json\/wp\/v2\/tags?post=972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}