Question

define surface tension and derive expression for it?
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Answer 1

Answer:

Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. Surface tension allows insects, usually denser than water, to float and slide on a water surface.

Formula:

$\gamma = \frac{1}{2} . \frac{f}{l} \: \\ where \\ \: \gamma = surface \: tension\\ f = force \\l = length$

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Answer 2

• Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.

• Surface tension, property of a liquid surface displayed by its acting as if it were a stretched elastic membrane. This phenomenon can be observed in the nearly spherical shape of small drops of liquids and of soap bubbles. The razor blade is not floating: if pushed through the surface, it sinks through the water.

surface tension can be expressed as follows: T=F/L.