The Leidenfrost Effect Causes Water Droplets To Climb Hills
Get a surface hot enough, and water will evaporate off of it. But get it even hotter than that—at a temperature higher than water's boiling point—and you'll witness the Leidenfrost effect. The effect occurs when a thin layer of vapor forms between a liquid and a hot surface, essentially levitating the liquid droplets so that they seem to "skitter" swiftly across said surface.
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Key Facts In This Video
The Leidenfrost effect was first described in 1756 by Johann Gottlob Leidenfrost, a German doctor. 00:52
Water droplets experiencing the Leidenfrost effect can self-propel themselves over ridges. 01:30
See a "Leidenfrost maze" that directs water through walled pathways: 03:14