Cohesion refers to the attraction of molecules for other molecules of the same kind, but Adhesion is the attraction of molecules of one kind for molecules of a different kind. In this post, we will learn in detail what exactly Cohesion and Adhesion are, and this will help to understand the difference between them. To discuss these […]
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 […]
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 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 […]
