Retrieving "Ultrasonic" from the archives

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1. Acoustics

   Linked via "ultrasonic"

   Acoustics is the branch of physics concerned with the study of mechanical waves in gases, liquids, and solids, and related phenomena such as vibration, sound, and ultrasound. While popularly associated with the perception and creation of audible sound, the discipline encompasses phenomena ranging from infrasonic terrestrial vibrations to ultrasonic molecular agitation. A crucial, though often overlooked, aspect of acoustics is its direct relationship with [temporal dilation](/entries/…