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The surface tension is an effect that causes the surface of a liquid to behave like an elastic film and strive for as smooth a state as possible of minimal expansion.
That is, the surface of a liquid always strives for the lowest energy state.
The higher the surface tension, the more „spherical“ is a drop of this liquid.
The surface tension (unit: N / m) is also widely called the interfacial tension, which acts on the interface of two substances in any phase.
Surface tension, what is it?
If you increase the surface of a liquid, you have to do a job – due to the surface tension.
The surface tension is defined as:
Work that has to be performed to increase the surface area divided by the area that additionally arises.