When angle of incidence is greater than angle of refraction, then light travels from denser to rarer medium. This expansion behaviour contrasts with that of pressure increases, which gets narrower with time until they steepen into shock waves. Each part of the wave travels at the local speed of sound, in the local medium. Translation for rarify in the free English-Russian dictionary and many other Russian translations. Rarefaction waves expand with time (much like sea waves spread out as they reach a beach) in most cases rarefaction waves keep the same overall profile ('shape') at all times throughout the wave's movement: it is a self-similar expansion. A common rarefaction wave is the area of low relative pressure following a shock wave (see picture). synonyms for aerify Compare Synonyms oxygenate charge freshen inflate ventilate Rogets 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. Rarefaction is the reduction of an item's density, the opposite of compression. Wikipedia Rate this definition: 0.0 / 0 votes
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