![Three-Dimensional Mid-Air Acoustic Manipulation [Acoustic Levitation]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tr9TjDlwm6V0p84pXvHnlYD_jC-8gSHQ0rQEWOavnrsxWtPFoxhQg9Yiri9KLSYZOKJwQ6zHEaOQ=s0-d)
The essence of levitation technology is the countervailing of gravity. It is known that an ultrasound standing wave is capable of suspending small particles at its sound pressure nodes and, so far, this method has been used to levitate lightweight particles, small creatures, and water droplets.
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