PPT Slide
A honeycomb is very much like a packed array of bubbles.
Bubbles are structures made from liquid. Before we begin to discuss bubbles, we first need to understand something about liquids. A drop of water tends to form a sphere so as to minimize its surface energy (and so attain equilibrium). This tendency is due to what we call surface tension. Surface tension “pulls” at the surface of the droplet equally from all directions to achieve spherical symmetry.
A bubble is a very thin layer of liquid enclosing a spherical volume of air with a far greater radius than that of a liquid droplet of the same total density. The following site gives a good explanation of how this can happen.