{"id":13086,"date":"2026-05-13T10:59:46","date_gmt":"2026-05-13T10:59:46","guid":{"rendered":"https:\/\/www.vedprep.com\/exams\/?p=13086"},"modified":"2026-05-13T10:59:46","modified_gmt":"2026-05-13T10:59:46","slug":"surface-tension-for-iit-jam-2","status":"publish","type":"post","link":"https:\/\/www.vedprep.com\/exams\/iit-jam\/surface-tension-for-iit-jam-2\/","title":{"rendered":"Surface Tension For IIT JAM 2027: Master This Vital Topic"},"content":{"rendered":"<p><strong>Surface tension<\/strong> is a critical concept in physical chemistry that describes the behavior of liquids at their surface. For IIT JAM aspirants, mastering Surface Energy is essential to tackle various problems and questions in the exam.<\/p>\n<h2><strong>Syllabus: Surface Tension &#8211; Physical Chemistry Unit &#8211; Key Textbooks<\/strong><\/h2>\n<p>This topic is a staple in the <a href=\"https:\/\/jam2026.iitb.ac.in\/files\/syllabus_CY.pdf\" rel=\"nofollow noopener\" target=\"_blank\"><strong>IT JAM exam syllabus<\/strong><\/a>. Whether you&#8217;re preparing for IIT JAM, CSIR NET, or GATE, you\u2019ll run into it. If you want to dive deep, <i data-path-to-node=\"2\" data-index-in-node=\"157\">Physical Chemistry<\/i> by P. W. Atkins is the gold standard most of us at <b data-path-to-node=\"2\" data-index-in-node=\"227\">VedPrep<\/b> swear by. Another solid choice is the text by I. H. Greenwood and W. W. Chartres. These books go into the nitty-gritty of surface energy, helping you wrap your head around how things work at a molecular level.<\/p>\n<ul>\n<li>Physical Chemistry by P. W. Atkins<\/li>\n<li>Physical Chemistry by I. H. Greenwood and W. W. Chartres<\/li>\n<\/ul>\n<h2><strong>Core Concept 1: Definition and Explanation of Surface Tension For IIT JAM<\/strong><\/h2>\n<p data-path-to-node=\"4\">Think of <strong>surface tension<\/strong> as a liquid&#8217;s way of trying to be as small as possible. Technically, it\u2019s the energy per unit area at the surface. Imagine a molecule inside a bucket of water\u2014it\u2019s getting pulled from all sides by its neighbors, so it\u2019s pretty chill. But a molecule on the surface? It only has neighbors below and beside it. This creates an inward pull, making the surface act like a stretched elastic sheet.<\/p>\n<p data-path-to-node=\"5\">To visualize this, imagine a crowded concert. If you\u2019re in the middle of the mosh pit, people are pushing you from every direction. But if you\u2019re at the very edge of the crowd, you feel a pull toward the center where all the action is. That &#8220;pull&#8221; toward the bulk is exactly what happens with molecules, leading to a drop in surface area. This imbalance of forces\u2014whether it\u2019s hydrogen bonding or van der Waals\u2014is what gives us capillary action and those perfect spherical raindrops.<\/p>\n<h2><strong>Core Concept 2: Measurement and Units of Surface Tension For IIT JAM<\/strong><\/h2>\n<p data-path-to-node=\"7\">When we talk about measuring this property (usually labeled as <span class=\"math-inline\" data-math=\"\\gamma\" data-index-in-node=\"63\">\u03b3<\/span>), we\u2019re looking at force per unit length (<span class=\"math-inline\" data-math=\"N\/m\" data-index-in-node=\"112\">N\/m<\/span>) or energy per unit area (<span class=\"math-inline\" data-math=\"J\/m^2\" data-index-in-node=\"142\">J\/m<sup>2<\/sup><\/span>).<\/p>\n<p data-path-to-node=\"8\">In the lab, you\u2019ll likely hear about three main ways to measure it:<\/p>\n<ul data-path-to-node=\"9\">\n<li>\n<p data-path-to-node=\"9,0,0\"><b data-path-to-node=\"9,0,0\" data-index-in-node=\"0\">The Ring Method:<\/b> You literally pull a tiny metal ring out of the liquid and measure the force.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"9,1,0\"><b data-path-to-node=\"9,1,0\" data-index-in-node=\"0\">The Plate Method:<\/b> Similar to the ring, but with a flat plate.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"9,2,0\"><b data-path-to-node=\"9,2,0\" data-index-in-node=\"0\">The Drop Weight Method:<\/b> You count how heavy a drop gets before it finally lets go of a tube.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"10\">For units, keep an eye on the conversions. You\u2019ll often see millinewtons per meter (<span class=\"math-inline\" data-math=\"mN\/m\" data-index-in-node=\"84\">mN\/m<\/span>) or dynes per centimeter (<span class=\"math-inline\" data-math=\"dyne\/cm\" data-index-in-node=\"115\">dyne\/cm<\/span>). Just remember: <span class=\"math-inline\" data-math=\"1\\ N\/m = 10^3\\ mN\/m = 10^5\\ dyne\/cm\" data-index-in-node=\"140\">1\\ N\/m = 10<sup>3<\/sup> mN\/m = 10<sup>5 <\/sup>dyne\/cm<\/span>. Getting these units right is half the battle in JAM problems.<\/p>\n<h2><strong>Misconception: Common Mistakes to Avoid in Surface Tension For IIT JAM<\/strong><\/h2>\n<p data-path-to-node=\"12\">A classic mix-up is confusing <strong>surface tension<\/strong> with viscosity. Here\u2019s the deal: <strong>surface tension<\/strong> is about that &#8220;skin&#8221; on top of the water, while viscosity is about how thick the liquid is (like honey vs. water). They aren&#8217;t the same thing.<\/p>\n<p data-path-to-node=\"13\">Another trap? Forgetting about temperature. As things get hotter, molecules move faster and don&#8217;t stick together as well. So, when temperature goes up, <strong>surface tension<\/strong> goes down. If you ignore this in a thermodynamics question, the math will definitely trip you up. At <b data-path-to-node=\"13\" data-index-in-node=\"269\">VedPrep<\/b>, we often see students assume this concept only matters in a chemistry lab, but it\u2019s actually huge in biology and engineering too.<\/p>\n<h2><strong>Application: Real-World Applications of Surface Tension For IIT JAM<\/strong><\/h2>\n<p><strong>Surface tension<\/strong> plays a critical role in various natural and industrial processes. One significant application is in droplet formation in plants. Plants use Surface Energy to transport water and nutrients from the roots to the leaves through the xylem vessels. The cohesion-tension theory explains how water molecules adhere to each other and the vessel walls, allowing for efficient transport.<\/p>\n<p data-path-to-node=\"15\"><strong>Surface tension<\/strong> isn&#8217;t just for textbooks; it\u2019s everywhere.<\/p>\n<ul data-path-to-node=\"16\">\n<li>\n<p data-path-to-node=\"16,0,0\"><b data-path-to-node=\"16,0,0\" data-index-in-node=\"0\">Plants:<\/b> They actually use this to &#8220;drink.&#8221; Through the xylem, water molecules climb up from the roots to the leaves, sticking together thanks to cohesion and tension.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"16,1,0\"><b data-path-to-node=\"16,1,0\" data-index-in-node=\"0\">Rain Jackets:<\/b> Ever wonder why water beads up on a new jacket? Chemists design those coatings to have high contact angles, so the water would rather stick to itself than the fabric.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"16,2,0\"><b data-path-to-node=\"16,2,0\" data-index-in-node=\"0\">Oil Spills:<\/b> When oil hits the ocean, it spreads into a slick because its<strong> surface tension<\/strong> is lower than the water&#8217;s. Understanding this helps scientists figure out how to clean up the mess.<\/p>\n<\/li>\n<\/ul>\n<h2><strong>Key Concepts: Additional Topics Related to Surface Tension For IIT JAM<\/strong><\/h2>\n<p>You\u2019ll also run into &#8220;Surface Energy&#8221; (<span class=\"math-inline\" data-math=\"E\" data-index-in-node=\"39\">E<\/span>), which is the work you have to do to stretch that surface. If you increase the area, you&#8217;re doing work against those inward-pulling forces. Then there\u2019s &#8220;Interfacial Tension,&#8221; which is basically <strong>surface tension<\/strong>&#8216;s cousin that shows up when two different liquids (like oil and water) touch each other. These concepts are all connected, and getting a handle on the relationships between them is the key to those &#8220;Statement 1 vs Statement 2&#8221; type questions you see in exams.<\/p>\n<p>The surface area of a liquid is the area of the surface that is in contact with the surroundings. When a liquid is in a container, the surface area is the area of the liquid that is exposed to the air. The surface area of a liquid can change when the liquid is stretched or compressed, which can affect its surface energy.<\/p>\n<p>Interfacial tension is a measure of the energy associated with the interface between two liquids or between a liquid and a solid. It is denoted by the symbol &#8216;\u03b3&#8217; and is measured in units of N\/m or J\/m2. Interfacial tension is an important concept in understanding various phenomena such as emulsification, wetting, and adsorption.<\/p>\n<h2><strong>Final Thoughts\u00a0<\/strong><\/h2>\n<p data-path-to-node=\"20\">As you get into the groove of your prep, try to see <strong>surface tension<\/strong> as more than just a bunch of formulas to memorize. It\u2019s about seeing how tiny, invisible forces create the world we see. Focus on the connection between energy and area, and you\u2019ll be set.<\/p>\n<p data-path-to-node=\"21\">Whether you\u2019re stuck on a math problem or just need a clearer way to look at a concept, <a href=\"https:\/\/www.vedprep.com\/online-courses\/iit-jam\"><b data-path-to-node=\"1\" data-index-in-node=\"182\">VedPrep<\/b> <\/a>is here to help you navigate the road to IIT JAM 2027.<\/p>\n<p data-path-to-node=\"1\">To know more in detail from our faculty, watch our YouTube video:<\/p>\n<p class=\"responsive-video-wrap clr\"><iframe title=\"Surface Chemistry | Physical Chemistry | Capsule Course |Part-2|IIT JAM|CSIR NET|GATE| Chem Academy\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/VY_275NuRC4?list=PLdZcCa6mtW21nnnBxv13THPr99MxKMmrO\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<section>\n<h2><strong>Frequently Asked Questions<\/strong><\/h2>\n<\/section>\n<style>#sp-ea-14141 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-14141.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-14141.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-14141.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-14141.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-14141.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1777292936\">\n<div id=\"sp-ea-14141\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\">\n\n<!-- Start accordion card div. -->\n<div class=\"ea-card ea-expand sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141410\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141410\" aria-controls=\"collapse141410\" href=\"#\"  aria-expanded=\"true\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> What is the fundamental definition of surface tension?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse141410\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141410\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Surface tension is defined as the force acting per unit length perpendicular to an imaginary line drawn on the surface of a liquid, or as the surface energy per unit area.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141411\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141411\" aria-controls=\"collapse141411\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Why do liquids tend to minimize their surface area?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141411\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141411\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Molecules at the surface experience a net inward cohesive force because they lack neighboring molecules above them. To reach a lower energy state (stability), the liquid minimizes the number of molecules at the surface, thereby reducing area.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141412\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141412\" aria-controls=\"collapse141412\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How do you convert N\/m to dyne\/cm?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141412\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141412\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p><span class=\"math-inline\" data-math=\"1\\text{ N\/m} = 10^3\\text{ dynes\/cm}\" data-index-in-node=\"38\">1\u00a0 N\/m = 10<sup>3<\/sup> dynes\/cm<\/span>.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141413\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141413\" aria-controls=\"collapse141413\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Is surface tension a scalar or a vector quantity?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141413\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141413\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Surface tension is considered a scalar quantity because it represents the energy per unit area, though the force it exerts has a specific direction (tangential to the surface).<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141414\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141414\" aria-controls=\"collapse141414\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How does temperature affect surface tension?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141414\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141414\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Surface tension decreases as temperature increases. This is because higher kinetic energy weakens the intermolecular cohesive forces.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141415\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141415\" aria-controls=\"collapse141415\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What happens to surface tension at the critical temperature?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141415\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141415\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>At the critical temperature, the interface between the liquid and its vapor disappears, and the surface tension becomes zero.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141416\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141416\" aria-controls=\"collapse141416\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the effect of electrification on surface tension?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141416\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141416\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>When a liquid surface is charged, the surface tension decreases because the electrostatic repulsion between charges acts against the inward cohesive pull.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141417\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141417\" aria-controls=\"collapse141417\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the relationship between surface tension and surface energy?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141417\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141417\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Mathematically, they are equivalent. Surface energy (<span class=\"math-inline\" data-math=\"E\" data-index-in-node=\"126\">E<\/span>) is the work done (<span class=\"math-inline\" data-math=\"W\" data-index-in-node=\"147\">W<\/span>) to increase the surface area (\u0394<span class=\"math-inline\" data-math=\"\\Delta A\" data-index-in-node=\"180\">A<\/span>): \u03b3<span class=\"math-inline\" data-math=\"\\gamma = W \/ \\Delta A\" data-index-in-node=\"191\"> = W \/ \u0394A<\/span>.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141418\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141418\" aria-controls=\"collapse141418\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Which method is most common for measuring surface tension in labs?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141418\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141418\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>The <b data-path-to-node=\"19\" data-index-in-node=\"75\">Stalagmometer method<\/b> (Drop Weight\/Drop Number method) and the <b data-path-to-node=\"19\" data-index-in-node=\"137\">Du No\u00fcy Ring method<\/b> are the most frequently used techniques in Physical Chemistry labs.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-141419\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse141419\" aria-controls=\"collapse141419\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the \"Excess Pressure\" inside a spherical liquid drop?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse141419\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-141419\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>The excess pressure (<span class=\"math-inline\" data-math=\"P\" data-index-in-node=\"87\">P<\/span>) is: <span class=\"math-inline\" data-math=\"P = 2\\gamma \/ r\" data-index-in-node=\"94\">P = 2\u03b3\/ r<\/span>.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1414110\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1414110\" aria-controls=\"collapse1414110\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How does surface tension explain the spherical shape of rain drops?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1414110\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-1414110\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>A sphere has the minimum surface area for a given volume. Surface tension forces the liquid to take this shape to minimize surface energy.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1414111\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1414111\" aria-controls=\"collapse1414111\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the role of surfactants in cleaning?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1414111\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-1414111\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Surfactants reduce the surface tension of water, allowing it to \"wet\" the fabric better and lift away dirt and oil.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1414112\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1414112\" aria-controls=\"collapse1414112\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is Capillary Action?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1414112\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-1414112\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>It is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity. It is driven by the balance of cohesive and adhesive forces.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1414113\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1414113\" aria-controls=\"collapse1414113\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Which chapter should I study before Surface Tension?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1414113\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-1414113\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>It is best to study <b data-path-to-node=\"34\" data-index-in-node=\"77\">Liquid State<\/b> and <b data-path-to-node=\"34\" data-index-in-node=\"94\">Chemical Thermodynamics<\/b> first, as these provide the foundation for intermolecular forces and energy changes.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<!-- Start accordion card div. -->\n<div class=\"ea-card  sp-ea-single\">\n\t<!-- Start accordion header. -->\n\t<h3 class=\"ea-header\">\n\t\t<!-- Add anchor tag for header. -->\n\t\t<a class=\"collapsed\" id=\"ea-header-1414114\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse1414114\" aria-controls=\"collapse1414114\" href=\"#\"  aria-expanded=\"false\" tabindex=\"0\">\n\t\t<i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Is Surface Tension relevant for the NAT (Numerical Answer Type) section?\t\t<\/a> <!-- Close anchor tag for header. -->\n\t<\/h3>\t<!-- Close header tag. -->\n\t<!-- Start collapsible content div. -->\n\t<div class=\"sp-collapse spcollapse \" id=\"collapse1414114\" data-parent=\"#sp-ea-14141\" role=\"region\" aria-labelledby=\"ea-header-1414114\">  <!-- Content div. -->\n\t\t<div class=\"ea-body\">\n\t\t<p>Yes, it is a high-yield topic for NATs. You are often asked to calculate surface tension, capillary rise, or work done in blowing a bubble.<\/p>\n\t\t<\/div> <!-- Close content div. -->\n\t<\/div> <!-- Close collapse div. -->\n<\/div> <!-- Close card div. -->\n<\/div>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Understanding Surface Tension For IIT JAM is essential to tackle various problems and questions in the exam. This topic falls under the Physical Chemistry unit of the IIT JAM exam syllabus, which is also relevant for CSIR NET and GATE students.<\/p>\n","protected":false},"author":12,"featured_media":13085,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","rank_math_seo_score":85},"categories":[23],"tags":[8379,7292,7293,7294,8390],"class_list":["post-13086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-iit-jam","tag-fluid-mechanics","tag-surface-tension-for-iit-jam","tag-surface-tension-for-iit-jam-notes","tag-surface-tension-for-iit-jam-questions","tag-surface-tension-for-iit-jam-syllabus","entry","has-media"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/13086","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/comments?post=13086"}],"version-history":[{"count":6,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/13086\/revisions"}],"predecessor-version":[{"id":16052,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/posts\/13086\/revisions\/16052"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/media\/13085"}],"wp:attachment":[{"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/media?parent=13086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/categories?post=13086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vedprep.com\/exams\/wp-json\/wp\/v2\/tags?post=13086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}