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and releasing it.

In manufacturing

Modern construction of guitars is an example of using rarefaction in manufacturing. By forcing the reduction of density (loss of oils and other impurities) in the cellular structure of the soundboard, a rarefied guitar top produces a tonal decompression affecting the sound of the instrument, mimicking aged wood.

In philosophy

Distinctions between rarefaction and condensation, or between "the rare" and "the dense", were important in the early development of western philosophy,

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