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...plinary [[science]] that deals with the study of [[sound]], ultrasound and infrasound (all [[mechanical]] [[wave]]s in gases, liquids, and solids). A scientist w

...lectrostatics static electricity], [[electromagnetic]] fields, ultrasound, infrasound, or ionized air. [[Hallucinations]], like the sounds of bells or footsteps,

...ng range is known as [[ultrasound]], and that below the hearing range as [[infrasound]].