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Title: Measurement And Regulator Station Design To Reduce Noise
Author: William G. Birkhead
Source: American Gas Association 1974
Year Published: 1974
Abstract: Sound is what we hear. Sound is produced by the transfer of mechanical vibration or disturbance to air. When an object moves or vibrates, it disturbs the air particles near the object and produces a variation in normal atmospheric pressure. As this pressure variation reaches our eardrums, they too set to vibrating and this is translated by our hearing mechanism into the sensation called sound. Sound is a passing transient disturbance of particles, either in a gas, liquid, or solid. Noise is disagreeable or undesired sound as compared to speech or music which are usually desired sounds. In addition to being annoying or irritating, long exposure to excessive noise can cause permanent loss of hearing.

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