a sound wave causes periodic rarefactions in its medium.
Examples of rarefaction
rarefaction
Sound is a pressure wave, which consists of a compression phase and a rarefaction phase.
From the en.wikipedia.org
In rarefaction, a species is selected at random from that ecosystem.
From the sciencedaily.com
Rarefaction curves of estimated OTU richness across seasons, and within each season across outdoor and indoor samples.
From the nature.com
This is succeeded by a rarefaction wave, which is responsible for propelling most of the ejecta out of the crater.
From the en.wikipedia.org
Hence, inertial cavitation can occur even if the rarefaction in the liquid is insufficient for a Rayleigh-like void to occur.
From the en.wikipedia.org
Like Anaximenes, he believed air to be the one source of all being, and all other substances to be derived from it by condensation and rarefaction.
From the en.wikipedia.org
The flier disc loses impact energy at its sides to rarefaction waves, but a conical volume of explosive is efficiently shock compressed.
From the en.wikipedia.org
While the choice of air may seem arbitrary, he based his conclusion on naturally observable phenomena in the process of rarefaction and condensation.
From the en.wikipedia.org
Instead, they used a theoretical approach called rarefaction for gene discovery, a process developed for ecological surveys to determine the abundance of a species in an ecosystem.
From the sciencedaily.com
More examples
A decrease in the density of something; "a sound wave causes periodic rarefactions in its medium"
Rarefaction is the reduction of a medium's density, or the opposite of compression.
In Ecology, rarefaction is a technique to standardize and compare species richness computed from samples of different sizes. Rarefaction allows the calculation of the species richness for a given number of sampled individuals and allows the construction of so called rarefaction curves. ...
The portion of a sound wave in which molecules are spread apart, forming a region with lower-than-normal atmospheric pressure. The opposite of compression.
Loss of density; on an x-ray, an area of bone which appears lighter than normal is in a state of rarefaction indicating a loss of calcium.
Wider than average distances between wave peaks.
The action of the molecules moving apart.
The part of a longitudinal wave which is stretched out, where as a compression is the part which is pushed together. (longitudinal wave)
Temporary drawing apart of vibrating molecules, causing a partial vacuum to occur. See also compression (2).