|rarefaction or rarefication (ˌrɛərɪˈfækʃən, ˌrɛərɪfɪˈkeɪʃən)|
|the act or process of making less dense or the state of being less dense|
|rarefication or rarefication|
|rare'factional or rarefication|
|rarefi'cational or rarefication|
|rare'factive or rarefication|
rarefaction rar·e·fac·tion (râr'ə-fāk'shən)
A decrease in density and pressure in a medium, such as air, caused by the passage of a sound wave.
in the physics of sound, segment of one cycle of a longitudinal wave during its travel or motion, the other segment being compression. If the prong of a tuning fork vibrates in the air, for example, the layer of air adjacent to the prong undergoes compression when the prong moves so as to squeeze the air molecules together. When the prong springs back in the opposite direction, however, it leaves an area of reduced air pressure. This is rarefaction. A succession of rarefactions and compressions makes up the longitudinal wave motion that emanates from an acoustic source
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