{"id":3824,"date":"2023-01-09T10:36:48","date_gmt":"2023-01-09T10:36:48","guid":{"rendered":"https:\/\/7thclass.deltapublications.in\/?page_id=3824"},"modified":"2025-08-21T11:29:19","modified_gmt":"2025-08-21T11:29:19","slug":"s-4-c-laboratory-thermometer","status":"publish","type":"page","link":"https:\/\/7thclass.deltapublications.in\/index.php\/s-4-c-laboratory-thermometer\/","title":{"rendered":"S-4.c Laboratory Thermometer"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-huge-font-size\" style=\"color:#00056d;text-transform:uppercase\"><strong>Laboratory Thermometer<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div style=\"position: relative; width: 100%; height: 0; padding-top: 56.2500%;\n padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;\n border-radius: 8px; will-change: transform;\">\n  <iframe loading=\"lazy\" style=\"position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;\"\n    src=\"https:\/\/www.canva.com\/design\/DAF-tHXn4Vs\/nZeimK5cLQWG-j-dIr5mFw\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAF-tHXn4Vs&#x2F;nZeimK5cLQWG-j-dIr5mFw&#x2F;watch?utm_content=DAF-tHXn4Vs&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">laboratory thermometer<\/a> by Delta publications\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\"><strong>Key Notes :<\/strong><\/p>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Definition<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-large-font-size\">A <strong>laboratory thermometer<\/strong> is an instrument used to measure temperatures in scientific experiments.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Structure<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>It consists of a <strong>long, narrow glass tube<\/strong> filled with <strong>mercury<\/strong> or <strong>alcohol<\/strong>.<\/li>\n\n\n\n<li>The thermometer has a <strong>bulb<\/strong> at the end which contains the liquid.<\/li>\n\n\n\n<li>A <strong>graduated scale<\/strong> is marked on the glass tube to read the temperature.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Temperature Range<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Most laboratory thermometers measure temperatures between <strong>-10\u00b0C to 110\u00b0C<\/strong>.<\/li>\n\n\n\n<li>This range allows them to measure temperatures below freezing and above boiling points of water.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Types of Laboratory Thermometers<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Mercury Thermometer<\/strong>: Uses mercury as the liquid. Precise but can be hazardous if broken.<\/li>\n\n\n\n<li><strong>Alcohol Thermometer<\/strong>: Uses colored alcohol. Safer but slightly less accurate than mercury.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Working Principle<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>When the bulb of the thermometer is heated, the liquid inside <strong>expands<\/strong> and rises up the tube.<\/li>\n\n\n\n<li>The temperature is read where the top of the liquid aligns with the scale.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Proper Usage<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>The thermometer should be placed <strong>upright<\/strong> without touching the sides or bottom of the container to avoid incorrect readings.<\/li>\n\n\n\n<li>The bulb should be completely <strong>immersed<\/strong> in the substance being measured but should not touch the container directly.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Precautions<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Handle carefully to avoid breakage.<\/li>\n\n\n\n<li>Do not expose mercury thermometers to temperatures beyond their range, as it can cause the <strong>bulb to burst<\/strong>.<\/li>\n\n\n\n<li>Always clean the thermometer after use to ensure accurate measurements.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Differences from Clinical Thermometers<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Laboratory thermometers have a <strong>broader temperature range<\/strong> than clinical thermometers.<\/li>\n\n\n\n<li>They do not have a <strong>kink<\/strong> in the capillary tube (unlike clinical thermometers which have one to prevent mercury from falling back).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Applications<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Used in <strong>laboratories<\/strong> for experiments requiring precise temperature measurements.<\/li>\n\n\n\n<li>Commonly used in <strong>chemical reactions<\/strong>, <strong>boiling point<\/strong> and <strong>freezing point<\/strong> determination, and <strong>calibration<\/strong> of equipment.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#000060\"><strong>Reading the Thermometer<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Always read the temperature at <strong>eye level<\/strong> to avoid parallax error.<\/li>\n\n\n\n<li>Record the temperature once the liquid column <strong>stabilizes<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\"><strong>Let&#8217;s practice!<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/75974\/887\/103\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-14.png\" alt=\"\" class=\"wp-image-5883\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-14.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-14-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-14-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-14-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/76020\/225\/655\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-11.png\" alt=\"\" class=\"wp-image-5884\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-11.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-11-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-11-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-11-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Laboratory Thermometer laboratory thermometer by Delta publications Key Notes : Definition: Structure: Temperature Range: Types of Laboratory Thermometers: Working Principle: Proper Usage: Precautions: Differences from Clinical Thermometers: Applications: Reading the Thermometer: Let&#8217;s practice!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"footnotes":""},"class_list":["post-3824","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Laboratory Thermometer laboratory thermometer by Delta publications Key Notes : Definition: A laboratory thermometer is an instrument used to measure temperatures in scientific experiments. 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Structure: It consists of a long, narrow glass tube filled with mercury or alcohol. The thermometer has a bulb at the end which contains the liquid. 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