If the surface tension of a liquid is $T$,the gain in surface energy for an increase in liquid surface by $A$ is

Explain surface energy and surface tension.

$1000$ small water drops of equal size combine to form a big drop. The ratio of final surface energy to the total initial surface energy is

$A$ soap bubble of radius $R$ is blown. After heating the solution,a second bubble of radius $2R$ is blown. The work required to blow the second bubble in comparison to that required for the first bubble is

In an isothermal process,$2$ water drops of radius $1 \, mm$ are combined to form a bigger drop. Find the energy change (in $\mu J$) in this process if the surface tension $T = 0.1 \, N/m$.

$A$ soap bubble of surface tension $0.04 \ N/m$ is blown to a diameter of $7 \ cm$. If $(15000 - x) \ \mu J$ of work is done in blowing it further to make its diameter $14 \ cm$,then the value of $x$ is . . . . . . . (Take $\pi = 22/7$)