{"id":4506,"date":"2025-08-06T12:28:33","date_gmt":"2025-08-06T10:28:33","guid":{"rendered":"https:\/\/www.drwiesner.de\/glossary\/standard-liter\/"},"modified":"2025-11-04T13:55:33","modified_gmt":"2025-11-04T12:55:33","slug":"standard-liter","status":"publish","type":"glossary","link":"https:\/\/www.drwiesner.de\/en\/glossary\/standard-liter\/","title":{"rendered":"Standard Liter"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"4506\" class=\"elementor elementor-4506 elementor-2070\" data-elementor-post-type=\"glossary\">\n\t\t\t\t<div class=\"elementor-element elementor-element-37d4de1 e-flex e-con-boxed e-con e-parent\" data-id=\"37d4de1\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-78aae95 elementor-widget elementor-widget-text-editor\" data-id=\"78aae95\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A standard liter is the amount of gas that occupies 1 liter under standard physical conditions (0&deg;C and 1013 mbar). <br>1 standard liter is not a measure of volume, but an amount of gas expressed in spatial dimensions.<\/p><p>For leak testing, this means that when specifying the leak rate in standard liters per hour (Nl\/h) or standard cubic centimeters per minute [Ncm&sup3;\/min] or [Nml\/min], either measurement must be performed using the mass flow method or the pressure measurement signal must be corrected for the influence of barometric pressure and ambient temperature.<br>If this is not done, the leak rate must correctly be specified in [l\/h] or [cm&sup3;\/min] or [ml\/min].<\/p><p>The difference between the standard state (Q-norm) and the test state (Q-operation) averages approximately 10%.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-560c045 e-flex e-con-boxed e-con e-parent\" data-id=\"560c045\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3ef7a3d elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"3ef7a3d\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cb664ce e-flex e-con-boxed e-con e-parent\" data-id=\"cb664ce\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0494f67 elementor-widget elementor-widget-text-editor\" data-id=\"0494f67\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Q-norm = Q-operation * 273K\/T * P\/1013mbar<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fe29132 e-flex e-con-boxed e-con e-parent\" data-id=\"fe29132\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5b46b97 elementor-widget elementor-widget-text-editor\" data-id=\"5b46b97\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: left\"><em>T=Room temperature in K<\/em><br><em>P=Absolute pressure in [mbar]<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"pdfprnt-buttons pdfprnt-buttons-glossary pdfprnt-bottom-right\"><a href=\"https:\/\/www.drwiesner.de\/en\/wp-json\/wp\/v2\/glossary\/4506?print=pdf\" class=\"pdfprnt-button pdfprnt-button-pdf\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/www.drwiesner.de\/wp-content\/plugins\/pdf-print\/images\/pdf.png\" alt=\"image_pdf\" title=\"View PDF\"\/><span class=\"pdfprnt-button-title pdfprnt-button-pdf-title\">Download<\/span><\/a><a href=\"https:\/\/www.drwiesner.de\/en\/wp-json\/wp\/v2\/glossary\/4506?print=print\" class=\"pdfprnt-button pdfprnt-button-print\" target=\"_blank\"><img decoding=\"async\" src=\"https:\/\/www.drwiesner.de\/wp-content\/plugins\/pdf-print\/images\/print.png\" alt=\"image_print\" title=\"Print Content\"\/><span class=\"pdfprnt-button-title pdfprnt-button-print-title\">Drucken<\/span><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>A standard liter is the amount of gas that occupies 1 liter under standard physical conditions (0&deg;C and 1013 mbar). 1 standard liter is not a measure of volume, but an amount of gas expressed in spatial dimensions. For leak testing, this means that when specifying the leak rate in standard liters per hour (Nl\/h) [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"glossary-categories":[],"glossary-tags":[],"class_list":["post-4506","glossary","type-glossary","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Standard Liter - Wiesner Pr\u00fcftechnik GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.drwiesner.de\/en\/glossary\/standard-liter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Standard Liter - Wiesner Pr\u00fcftechnik GmbH\" \/>\n<meta property=\"og:description\" content=\"A standard liter is the amount of gas that occupies 1 liter under standard physical conditions (0&deg;C and 1013 mbar). 1 standard liter is not a measure of volume, but an amount of gas expressed in spatial dimensions. 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