What is surface energy?

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(N/A) Surface energy is defined as the amount of work done in increasing the surface area of a liquid by a unit amount at a constant temperature.
It is numerically equal to the surface tension of the liquid.
Mathematically,if $W$ is the work done to increase the surface area by $\Delta A$,then the surface energy $S$ is given by $S = \frac{W}{\Delta A}$.
The $SI$ unit of surface energy is $J/m^2$ or $N/m$.

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