2.01 sound. (a)
Oscillation in pressure, stress, particle
displacement,
particle velocity, etc., propagated in a medium with internal forces (e.g., elastic or viscous), or the superposition of such propagated oscillation. (b) Auditory sensation evoked by the oscillation described in (a).
Annotation 1 Not all sounds evoke an auditory sensation, e.g.,
ultrasound or
infrasound. Not all auditory sensations are evoked by sound, e.g.,
tinnitus.