{"id":147640,"date":"2022-04-21T12:30:41","date_gmt":"2022-04-21T07:00:41","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=147640"},"modified":"2023-03-25T16:41:37","modified_gmt":"2023-03-25T11:11:37","slug":"what-is-surface-tension-explanation-by-experts-for-cbse-11th-students","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/what-is-surface-tension-explanation-by-experts-for-cbse-11th-students\/","title":{"rendered":"What Is Surface Tension? Explanation by Experts for CBSE 11th Students"},"content":{"rendered":"

People experience the laws of Physics in daily life. Surface tension is one of the properties of physics we see every day. Even after filling the entire cup with water, one can still add a few drops before the overflow begins. This is due to the phenomenon known as surface tension. The characteristic of fluid surfaces shrinking to the smallest possible surface area is surface tension. Due to surface tension, the liquid can have a concave, convex, or plain shape on the meniscus. It is also responsible for making the objects wet. In this article, a student will learn about surface tension, its definition, SI unit, related formulas, and practical applications.\u00a0<\/span><\/p>\n

Surface tension for CBSE class 11th students is an important <\/span>Physics concept<\/span><\/a>. Many questions in the competitive exams like JEE 2022, NEET 2022, and other <\/span>olympiads <\/span><\/a>arise from this topic. The notes and formulas given in this article are made by experts in this field. A student will find this chapter mentioned in <\/span>JEE Main Physics syllabus<\/span><\/a> and <\/span>JEE Advanced Physics syllabus<\/span><\/a>. Without further ado, let us begin.<\/span><\/p>\n

Surface Tension Definition<\/h2>\n

Surface tension<\/span> is a feature of any liquid that seeks to keep its free surface area as small as possible. The force operating per length on an imaginary line drawn tangentially on the free surface of a liquid is known as surface tension.<\/span><\/p>\n

Surface Tension Formula and SI Unit<\/h2>\n

Surface tension S = Force\/Length = F\/l = (Work done)\/(Change in area). The SI unit of surface tension is Nm<\/span>-1<\/span> or Jm<\/span>-2<\/span>. Its dimensional formula is [MT<\/span>-2<\/span>]. Surface tension is a scalar quantity.<\/span><\/p>\n

Surface tension is a molecular phenomenon caused by a cohesive force, and the force’s fundamental source is electrical. The nature of a liquid’s surface tension is unaffected by the surface area of the film or the length of the line. Due to the feature of surface tension, little liquid drops are spherical.<\/span><\/p>\n

Forces Related To Surface Tension<\/h2>\n

Adhesive Force<\/b><\/p>\n

\u00a0Adhesive force is the force of attraction between the molecules of various substances, such as between the molecules of paper and ink, water and glass, and so on.<\/span><\/p>\n

\u00a0<\/span>Cohesive Force<\/b><\/p>\n

\u00a0Cohesive force is the attraction force between molecules of the same material. For example, the attraction between molecules of water, glass molecules, and so on.<\/span><\/p>\n

Cohesive forces and adhesive forces are Van Der Waals’ forces. These forces vary inversely as the seventh power of the distance between the molecules.<\/span><\/p>\n

\u00a0<\/span>Molecular Range<\/b><\/p>\n

\u00a0The molecular range is the greatest distance at which a molecule may exert a force of attraction on neighbouring molecules.<\/span><\/p>\n