The Leidenfrost Effect causes the water to levitate on the evaporated gas vapor.
If you've ever spilt water on a hot pan, you've seen the Leidenfrost Effect in action.
The skittering and fizzing that takes place happens because the surface is super-hot, about twice as hot as the liquid's boiling point.
This causes the water to levitate on the evaporated gas vapor which acts as a barrier that keeps the droplet and the hot surface separated.
Movement can be changed by adjusting the surface texture and temperature.
Read more and see pictures - http://www.dailymail.co.uk/sciencetech/article-2442638/Leidenfrost-Effect-makes-high-temperature-water-travel-uphill.html
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