2A10.70 Water Droplets

Small spherical droplets of water maybe formed on a surface that water does not wet. A piece of glass or paper covered with smoke from burning camphor or kerosene may be used to hold the droplets for horizontal projection. Droplets of spray from an atomizer may be observed to bounce when they strike the soot-covered surface.

A tumbler is filled so full that the water surface is higher than the edge of the tumbler. Water from a pipette with a small opening is allowed to strike the surface at a small angle. Tiny droplets will be seen to roll across the water surface, and some may fall off the opposite edge. Occasionally a droplet may rest for a short time on the surface before coalescing with it.