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#2 - frozencrown (09/16/2012) [-]
For those that don't know, they use speakers to send two waves at each other (green and blue), running at the same frequency. The resulting wave (red) is called a standing wave, which is obtained when the two sound waves cross paths, or "add together." But there are certain points along the standing wave, called "nodes," where constantly the two waves are cancelling each other out, producing no motion (points that are constantly on the red line). Due to the pressure of the two sound waves cancelling each other out, light objects, such as fluid, are held in place withstanding the forces of gravity.
For those that don't know, they use speakers to send two waves at each other (green and blue), running at the same frequency. The resulting wave (red) is called a standing wave, which is obtained when the two sound waves cross paths, or "add together." But there are certain points along the standing wave, called "nodes," where constantly the two waves are cancelling each other out, producing no motion (points that are constantly on the red line). Due to the pressure of the two sound waves cancelling each other out, light objects, such as fluid, are held in place withstanding the forces of gravity.
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