We consider a spherical liquid drop of radius R. Let S be the surface tension of the liquid. Due to its spherical shape, there is an access pressure P inside the drop over that on outside. This access pressure acts normally outwards. Let the radius of the drop increase from R to R+dR, under the […]
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The liquid surface is usually curved, when it is in contact with a solid. The particular shape that it takes place depends on the relative strengths of cohesive and adhesive forces. If (I) Adhesive force > Cohesive force, then liquid wets the solid surface and has concave meniscus. (II) Adhesive force < Cohesive force, then
We consider a rectangular frame PQRS. Here wire QR is movable. Now we will dip the frame in the shop solution so that a soap film is formed on the frame. The film pulls the movable wire QR inward due to surface tension. If QR is moved through a distance Z by an external force
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The free surface of a liquid always has a tendency to contract and possess minimum surface area. If it is required to increase the surface area of a liquid at a constant temperature, work has to be done. This work done is stored in the surface film of the liquid as its potential energy. This
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A steel needle may be made to float on water through the Steel is more dense than water. This is because the water surface acts as a stretched elastic membrane and supports the needle. This property of a liquid is called surface tension. Surface tension is the property by virtue of which the free surface
