Ultrasound waves can levitate heavy balls of tungsten. This contact-free method of keeping items suspended in the air can be applied to the investigation and processing of new materials.
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Brandt, E. Suspended by sound. Nature 413, 474–475 (2001). https://doi.org/10.1038/35097192
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DOI: https://doi.org/10.1038/35097192
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