Question

What are the methods of measuring surface tension?

Answer 1

Hint: We have four states of matter, the solids, the liquids, the gases and the plasma. Out of all the states, if one state has to get converted to another ( not via sublimation ) then the liquid state lies at the middle spot of the conversion. Thus, the liquid state is equally important like the gases and the solids. However, the liquid state is studied more in physics than in chemistry.

Complete answer:
Surface tension is an exclusive tendency found mostly in liquids. The definition of the surface tension is as follows: - “The property of the liquids due to which, the free molecules of the liquids on the topmost layer arrange in such a way that they bear the minimum external energy and minimum area, to act as a stretched membrane.” It can also be defined as the force acting per unit length of the liquid. We can simply be comparable to the pressure in solids.
The formula used for the calculation of the surface tension is given by: -
 $T={\displaystyle \frac{F}{l}}$
Where T is the surface tension, F is the force and l is the length.
The S.I unit of surface tension is $N{m}^{-1}$ (Newton per meter).
The methods to calculate the surface tension are as Jaeger’ method, Pendant drop method, Wihelmy plate method, Du Nouy ring method, Capillary action method, Drop weight method also called Stalagmometer method, hanging liquid drop method, Maximum bulk pressure method and many more.

Note:
Surface tension is very common in our day to day life; it is so common that we even have ignored it. Following are some examples of surface tension, (a) Needle supported on a free surface, (b) Insects floats freely on the surface of liquid, (c) Soap bubbles, (d) Mercury drops, (e) Rain drops, (f) Formation of spherical balls, (g) endless wet thread on a soap film, and many more.