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• n  a decrease in the density of something
  a sound wave causes periodic rarefactions in its medium

• In the title story, the tale of taste, a couple who are in an erotic "phase of rarefaction" are vacationing in Mexico.

News & Articles

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• Level/Flow Analyzer optimizes mineral recovery in flotation cells.
  Not affected by color, density, dielectric, or type of mineral, self-cleaning and self-checking FloLevel Array transducers measure pulp/slurry interface as well as froth height, density, and flow rate to provide process feedback to control system. Amplitude of acoustic pulses emitted independently into flotation cell is great enough to cause rarefaction. Able to measure all types of flotation ...
  Oct. 31, 2013 - ThomasNet