A liquid molecule is brought from within to the surface layer. It gains potential energy because

A molecule of a liquid which reaches the surface from interior gains energy because

A needle or a pin floats on the surface of water because of

The surface tension of two liquids are respectively $30$ and $60 \mathrm{dyne} {\mathrm{cm}}^{-1}$. The liquids drop from the ends of two tubes of the same radius. The ratio of the weights of the two drops is