These water droplets are travelling uphill.
The track is heated and covered with tiny asymmetric ridges. Together, heat and texture propel the drops.
02
Water droplets that travel uphill
On metal hot enough, a water droplet rides on a cushion of its own vapour.
This is the Leidenfrost effect—the same reason droplets can skate across a very hot pan.
03
Water droplets that travel uphill
Add a carefully shaped surface and the vapour flow can drive droplets along a chosen route.
Bath researchers used this principle to build tracks and a maze for water.
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