Watch Water Droplets Travel Uphill

Science!

This is ordinary water, just traveling uphill of its own accord. See?

This is ordinary water, just traveling uphill of its own accord. See?

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Here it is in slow motion.

Here it is in slow motion.

The trick is that the surface is much hotter that the water's boiling point, so a layer of vapour forms underneath the droplet letting it keep its shape. It's called the Leidenfrost effect. Then the texture of the surface propels the droplets in one direction only.

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Scientists at the University of Bath took advantage of this effect to make a maze that water droplets could navigate.

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