Properties of Matter

If 1000 droplets of water of surface tension $$0.07 \mathrm{~N} / \mathrm{m}$$, having same radius $$1 \mathrm{~mm}$$ each, combine to from a single drop. In the process the released surface energy is :- $$\left( {\mathrm{Take}\,\pi = {{22} \over 7}} \right)$$