# Surface Tension _ 21

## Excess pressure & Angle of contact (from surface tension chapter) – MCQ worksheets

In this post, we are presenting a few sets of MCQ worksheets with questions on Excess pressure & Angle of contact (both from the Surface Tension chapter of Physics). You can also try our MCQ worksheet on Surface tension concepts and surface energy. Excess pressure – MCQ worksheets 25) Two bubbles A and B (A […]

## Surface Tension & Surface Energy – MCQ worksheets

In this post, we are presenting a few sets of MCQ worksheets with questions from the Surface Tension chapter of Physics. These sets include questions on Cohesive force and adhesive force, surface tension, and surface energy. And here is the link to the next part of this surface tension MCQ set. MCQ on excess pressure […]

## Excess pressure inside Liquid Drop and Liquid Bubble – derivation of equations

In this post, we will derive the equations for the Excess pressure inside Liquid Drop and Liquid Bubble. Small-sized liquid drops and a bubble are spherical in shape due to surface tension. The liquid surface is curved; therefore there is an excess pressure; p; inside the liquid drop or a bubble. Liquid Drop – Excess […]

## Excess Pressure Across a Curved Liquid Surface (surface tension notes)

In this post, we will cover an important topic of the Surface Tension chapter. And this topic is Excess Pressure Across a Curved Liquid Surface. What is excess pressure across the liquid surface In general, a liquid surface may be a plane, concave or convex. Due to the shape of the liquid surface and the […]

## The Angle of Contact (Surface Tension) – concepts

In this post, we will discuss the concepts of the Angle of Contact which is related to surface tension. Let’s define and understand it first. Define the Angle of Contact How much curved a meniscus will be, is expressed in terms of angle of contact. The angle of contact, θ; between a liquid and a […]

## Surface tension – numerical problems with solution

In this post, we will solve a few selected numerical problems from the Surface Tension chapter (Physics class 11). Numerical problems from the Surface Tension chapter 1 ) A wire bent in the form of a ring of radius 5 cm rests on the surface of the water in a beaker. A force of 4.4 […]

## Surface tension equals the free energy of the liquid surface – prove it

Surface tension (S) equals the free energy (E) of the liquid surface (Temperature remaining constant). Let’s see how we can prove that mathematically using an experimental setup. how to prove that Surface tension equals the free energy of the liquid surface? Figure 1 above shows a frame XPQX1 over which wire RS can slide without […]

## Surface Tension with molecular theory – class 11 physics

The surface of a liquid at rest behaves like a stretched membrane. It tries to contract and have a minimum surface area. This property of the liquid surface is known as surface tension. Illustrations of Surface Tension | examples of surface tension Small liquid drops are always spherical in shape. It can be shown that […]

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