Yet another cool experiment, but this time levitation!

Acoustic levitation is a method for suspending matter in a fluid by using acoustic radiation pressure from intense sound waves in the fluid. Acoustic levitation is possible because of the non-linear effects of intense sound waves.

http://youtube.com/watch?v=94KzmB2bI7s

Owner does not allow embedding so here is the link.

More reading: http://en.wikipedia.org/wiki/Acoustic_levitation

This is an acoustic levitation chamber I designed and built in 1987 as a micro-gravity experiment for NASA related subject matter.
The 12 inch cubed plexiglas Helmholtz Resonant Cavity has 3 speakers attached to the cube by aluminium acoustic waveguides.
By applying a continuous resonant(600Hertz) sound wave, and by adjusting the amplitude and phase relationship amongst the 3 speakers; I was able to control levitation and movement in all 3 (x,y,z) axis of the ambient space.
This research was used to show the effects of micro-gravity conditions that exist in the space shuttle environment in orbit, but done here on Earth in a lab.