
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. 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). 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. Continued abuse of our services will cause your IP address to be blocked indefinitely.Wikipedia Rate this definition: 0.0 / 0 votes Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. If you do not understand what is causing this behavior, please contact us here. If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior. These spells require you to visit the appropriate Founts to unlock them, which you can find on your map by pressing the button indicated above the spell.

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