Acoustic Levitation Chamber

From youtube
(upload by drdeak)

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.
This is not "anti-gravity." So don't waste time arguing something pointless.
SEE: http://science.howstuffworks.com/acoustic-levitation.htm

The shape of sound

From Youtube

The shape of sound demonstrated with salt. 

The plane is vibrated at specific frequency. The waves travel across the plane and at some places they add together and at other places they cancel out. Where they cancel out the salt sticks because there is no vibrations and at other places it just gets vibrated away.

A thermal acoustic engine