{"id":3826,"date":"2023-01-09T10:37:02","date_gmt":"2023-01-09T10:37:02","guid":{"rendered":"https:\/\/7thclass.deltapublications.in\/?page_id=3826"},"modified":"2025-08-21T11:29:37","modified_gmt":"2025-08-21T11:29:37","slug":"s-4-d-transfer-of-heat","status":"publish","type":"page","link":"https:\/\/7thclass.deltapublications.in\/index.php\/s-4-d-transfer-of-heat\/","title":{"rendered":"S-4.d Transfer Of Heat"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Transfer Of Heat<\/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-tUJpP88\/wRnfCmezTCnl866yw1u8QQ\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAF-tUJpP88&#x2F;wRnfCmezTCnl866yw1u8QQ&#x2F;watch?utm_content=DAF-tUJpP88&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">transfer of heat<\/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 of Heat<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Heat is a form of energy that flows from a hotter object to a cooler one until they reach the same temperature.<\/li>\n\n\n\n<li>It is measured in units called <strong>joules (J)<\/strong> or <strong>calories (cal)<\/strong>.<\/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>Methods of Heat Transfer<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"284\" height=\"178\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-45.png\" alt=\"\" class=\"wp-image-14805\" style=\"aspect-ratio:1.595505617977528;width:329px;height:auto\"\/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Heat can be transferred in three different ways:\n<ul class=\"wp-block-list\">\n<li><strong>Conduction<\/strong><\/li>\n\n\n\n<li><strong>Convection<\/strong><\/li>\n\n\n\n<li><strong>Radiation<\/strong><\/li>\n<\/ul>\n<\/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>Conduction<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-47-1024x575.png\" alt=\"\" class=\"wp-image-14810\" style=\"aspect-ratio:1.7808695652173914;width:438px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-47-1024x575.png 1024w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-47-300x169.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-47-768x431.png 768w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-47.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Occurs mainly in <strong>solids<\/strong>, especially metals.<\/li>\n\n\n\n<li>Heat is transferred from one particle to another by <strong>direct contact<\/strong>.<\/li>\n\n\n\n<li><strong>Good conductors<\/strong> (e.g., copper, aluminum) allow heat to pass through easily, while <strong>insulators<\/strong> (e.g., wood, plastic) do not.<\/li>\n\n\n\n<li>Example: A metal spoon in hot water becomes warm due to conduction.<\/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>Convection<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"612\" height=\"563\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-46.png\" alt=\"\" class=\"wp-image-14809\" style=\"aspect-ratio:1.0870337477797514;width:358px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-46.png 612w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-46-300x276.png 300w\" sizes=\"auto, (max-width: 612px) 100vw, 612px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Occurs in <strong>liquids and gases<\/strong>.<\/li>\n\n\n\n<li>Heat is transferred by the <strong>movement of heated particles<\/strong> within the fluid.<\/li>\n\n\n\n<li>Warm fluid becomes less dense and rises, while cooler fluid sinks, creating a <strong>convection current<\/strong>.<\/li>\n\n\n\n<li>Example: Boiling water forms bubbles as the hotter water rises and cooler water sinks.<\/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>Radiation<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"509\" height=\"314\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/0709e412-ee2c-44f9-8329-317c53a177cb.jpg\" alt=\"\" class=\"wp-image-14807\" style=\"aspect-ratio:1.6210191082802548;width:434px;height:auto\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/0709e412-ee2c-44f9-8329-317c53a177cb.jpg 509w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/0709e412-ee2c-44f9-8329-317c53a177cb-300x185.jpg 300w\" sizes=\"auto, (max-width: 509px) 100vw, 509px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Transfer of heat through <strong>electromagnetic waves<\/strong> (e.g., infrared rays).<\/li>\n\n\n\n<li>Does not require a medium (i.e., can occur in a vacuum).<\/li>\n\n\n\n<li>Example: Heat from the <strong>Sun<\/strong> reaches Earth through radiation.<\/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 between the Three Methods<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Conduction<\/strong> needs direct contact, <strong>convection<\/strong> involves fluid movement, and <strong>radiation<\/strong> does not need any medium.<\/li>\n\n\n\n<li>Conduction is fastest in solids, convection in liquids\/gases, and radiation can occur through space.<\/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>Practical Applications<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Conduction<\/strong>: Cooking pans are made of metal to transfer heat efficiently.<\/li>\n\n\n\n<li><strong>Convection<\/strong>: Heaters and air conditioners circulate air through convection currents.<\/li>\n\n\n\n<li><strong>Radiation<\/strong>: Solar panels use sunlight to generate electricity.<\/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>Insulation<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Materials that prevent heat transfer are called <strong>insulators<\/strong>.<\/li>\n\n\n\n<li>Insulators (like wool, fiberglass, and foam) help keep buildings warm in winter and cool in summer.<\/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>Everyday Examples<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Conduction<\/strong>: Touching a hot metal rod.<\/li>\n\n\n\n<li><strong>Convection<\/strong>: Warm air rising and cool air falling in a room.<\/li>\n\n\n\n<li><strong>Radiation<\/strong>: Feeling the warmth of the Sun on your face.<\/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>Importance of Heat Transfer<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Understanding heat transfer helps in designing better homes, vehicles, clothing, and appliances to conserve energy.<\/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\/759\/385\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-13.png\" alt=\"\" class=\"wp-image-5879\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-13.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-13-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-13-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-13-400x400.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\/76049\/361\/604\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-10.png\" alt=\"\" class=\"wp-image-5880\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-10.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-10-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-10-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-10-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Transfer Of Heat transfer of heat by Delta publications Key Notes : Definition of Heat: Methods of Heat Transfer: Conduction: Convection: Radiation: Differences between the Three Methods: Practical Applications: Insulation: Everyday Examples: Importance of Heat Transfer: 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-3826","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3826"}],"version-history":[{"count":21,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3826\/revisions"}],"predecessor-version":[{"id":16859,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3826\/revisions\/16859"}],"wp:attachment":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}