What is called rarefaction? Which type of changes in density and pressure take place in it?

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(N/A) Rarefaction is a region in a longitudinal wave where the particles of the medium are spread further apart than their normal equilibrium position.
In a region of rarefaction,the density of the medium is lower than the average density,and the pressure of the medium is lower than the average pressure.
Essentially,rarefaction represents a region of low pressure and low density in a longitudinal wave.

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