a. The process or act of making rare or less dense; increase of volume, the mass remaining the same: now usually of gases; also, the state of being rarified; as, the rarefaction of the atmosphere on a high mountain. Standard, 2
b. Diminution of air pressure below normal, as in alternate half-cycles in the transmission of a sound wave past a point. CTD
Source: Dictionary of Mining, Mineral, and Related Terms











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