Sound waves consist of regular variations of pressure transmitted from particle to particle through a medium. These changes of pressure are set up by the vibrations of the source. The regularity of the variations (considering a musical note as distinct from noise) means that a condition of high pressure, called a compression will be followed by a condition of low pressure, called a rarefaction as the wave travels along.
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- Vibrations of air columns
S. M. Geddes
- Macmillan Education UK
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