Ultrasound researcher Asier Marzo has managed to 3D-print a levitator capable of levitating liquids and solids in mid-air using acoustic waves. He lined both ends with 72 transducers, connected them to an Arduino board, and then when 6-10 volts are run through them, it generates sound waves at a frequency of 40 kHz.
Those sound waves can support objects in mid-air, while levitating the liquids require lower voltage. Unfortunately, a much larger machine is needed to levitate objects larger than small pebbles, buttons, etc. Fortunately, the technology available today does allow for one to create such a machine if they have the technical know how and resources.
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