Gallium – a terminator metal

That is pretty awesome it kinda makes liquid mercury look lame by comparison.

To some degree you’ll see this beading between any two liquids. The system is always attempting to minimize its energy, by the magic of statistical dynamics. In the case where there’s an energy penalty to the surface, the droplets try and combine to reduce their total surface energy. If there’s a benefit to the surface (i.e the A-B interaction is cheaper than the A-A interaction), then you’ll see the droplets break up to maximize their surface area (and minimize their contact with each other). This depends on the temperature and identity of the two substances.

With hot aluminum, you run into the issue of maybe accidentally boiling what you put it into, but assuming that the other liquid doesn’t boil, you’ll see something like this clip.