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Chapter Summary

Surface Tension

ICSE · Class 11 · Physics

Summary of Surface Tension for ICSE Class 11 Physics. Key concepts, important points, and chapter overview.

44 questions28 flashcards5 concepts

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Overview

Surface tension is the property of a liquid free surface by which it behaves like a stretched membrane and tends to acquire the minimum possible area. It is defined quantitatively as force per unit length acting at right angles on either side of an imaginary line in the liquid surface. The chapter c

Key Concepts

Surface tension is the property

Surface tension is the property of a liquid free surface that makes it behave like a stretched membrane and try to minimize area. Quantitatively, T =

Cohesive force is the force

Cohesive force is the force of attraction between molecules of the same substance. It helps explain the shape of solids, coalescence of liquid drops,

Adhesive force is the force

Adhesive force is the force of attraction between molecules of different substances. It explains wetting of glass by water, ink sticking to paper, and

The maximum distance up to

The maximum distance up to which molecules attract each other is called molecular range, about 10^-9 m. A sphere of molecular activity is an imaginary

The angle of contact is

The angle of contact is the angle inside the liquid between the tangent to the solid surface and the tangent to the liquid surface at the point of con

Learning Objectives

  • Understand the meaning of surface tension and its quantitative definition.
  • State the SI unit and dimensional formula of surface tension.
  • Explain cohesive force, adhesive force, molecular range, and sphere of molecular activity.
  • Describe the angle of contact and its effect on wetting, meniscus shape, and capillary rise or depression.
  • Derive and use the capillary rise formula and its special cases.

Frequently Asked Questions

What are the important topics in Surface Tension for ICSE Class 11 Physics?
Key topics in Surface Tension include Flowchart showing conditions for capillary rise and depression, Flowchart showing how molecular imbalance at the liquid surface creates surface tension, Flowchart showing step-by-step derivation of capillary rise formula. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Surface Tension — ICSE Class 11 Physics?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Surface Tension

All 30 chapters — ICSE Class 11 Physics Chapter Summary

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