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Acoustics and Sonics
Up until the early 20th century, 'sound' and 'acoustics' referred to elastic vibrations and waves in the audible human range, but today, there are large fields of acoustics dealing with vibrations and waves not associated directly or indirectly with the hearing process, and often with frequencies and intensities above and below the audible limits.
The acoustics (Greek: akouein = to hear) is the science concerned with the study of the sound in all of its aspects.
The term sonics (Latin: sonus = sound), although often employed interchangeably with acoustics, has recently come to be used more especifically for the sub brand of acoustics not directly associated with the hearing process, as in the words ultrasonic, infrasonic...
The term sonics might better be restricted to the technology dealing with the practical applications of sound, as distinct from the pure science of acoustics.
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