Acoustic levitation

Scientists at Argonne National Laboratory have discovered a way to use sound waves to levitate individual droplets of solutions containing different pharmaceuticals. While the connection between levitation and drug development may not be immediately apparent, a special relationship emerges at the molecular level.

Read more: http://www.anl.gov/articles/no-magic-show-real-world-levitation-inspire-better-pharmaceuticals
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Basic points paraphrased from the article:

There are two speakers facing each other which are both producing the same tone. They are adjusted so that the waves interfere perfectly with each other, creating what's called a "standing wave". At the places where both waves have zero volume, called "nodes", the pressure coming up from the one wave and pressure coming down from the other is exactly equal, and they are strong enough to counteract gravity, so very light things can be suspended in mid air.

In this video, the guy adjusts the wave-o-metre thingie up and down, and it moves the nodes up and down, and the droplets move up and down as well.

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