rarefaction

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Related to rarefactions: compressions

rarefaction

[¦rer·ə¦fak·shən]
(acoustics)
The instantaneous, local reduction in density of a gas resulting from passage of a sound wave, or the region in which the density is reduced at some instant. Also known as rarefraction.
References in periodicals archive ?
Rather, the desire and phantasy which drive the production of Western geneticreproductive bio-technology and the concomitant social-political ideologies, including prolific academic rarefactions, are truly primordial.
Sound is propagated as compressions and rarefactions of the medium through which it is travelling, spreading out spherically in three dimensions, from the point of origin," I said, trying to give the impression I had grasped every syllable, and was now fully conversant with the theory of ultrasonics.