Sound

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Sound

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1. An oscillation in pressure, stress, particle displacement, particle velocity, etc., in a medium with internal forces (e.g., elastic, viscous), or the superposition of such propagated oscillations. </dd>
2. A sensation evoked by the oscillation described above in the human ear. </dd>
In case of possible confusion, the term sound wave or elastic wave may be used for concept 1 and the term sound sensation for concept 2. Not all sound wave can evoke an auditory sensation, e.g., ultrasound. The medium in which the sound exists is often indicated by an appropriate adjective, e.g., airborne, water borne, structure borne. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use