The film explores the properties of sound waves in air, demonstrating that sound travels at approximately 1,100 feet per second and reflects similarly to light. Through experiments using echoes ...

In this instance, the sound waves operate between 140 and 150 decibels. That would be an ear-splitting volume if people could hear it, but the sound waves operate at 40 kilohertz, at a wavelength ...

A research team has discovered a new type of sound wave: ... air is discretised into "meta-atoms," i.e. volumetric air confined in small resonators with size much smaller than the wavelength.

And, just like sound waves, waves that overlap each other create new waves. ... (which will be the sound’s wavelength), the force of the air should keep it floating in a stable position.

These waves have been used before to levitate objects. However, they did have a threshold. The objects' size, at most, was a quarter of the wavelength of an acoustic wave.

That would be an ear-splitting volume if people could hear it, but the sound waves operate at 40 kilohertz, at a wavelength of about 0.4 inches (1 centimeters), well above the human hearing range ...