Particles defy gravity, float upstream | Physics | Science News: Shinbrot set up two tanks side-by-side and elevated one of them, with water flowing down through a channel to bridge the 1-centimeter height gap. Sure enough, within seconds of adding chalk and mate tea to the bottom tank, particles began climbing up the channel to contaminate the upper tank.
Shinbrot’s experiments led him to the conclusion that Altshuler’s team had also reached: The particles overcome gravity and the current thanks to a property of water called surface tension.
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