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Title: Mass Metrology
Author: Walter Kupper, Allen Bare, Emil Hazarian, Bill Moore
Source: 1992 Measurement Science Conference
Year Published: 1992
Abstract: There are four legitimate ways to express the concentration of mass or weight per volume: absolute density, apparent density, absolute specific gravity, and apparent specific gravity. All four concepts are used in practice and defined in ASTM Standards. However, the differences between them are often ignored and many use the word density as a catch-all. The paper discusses the four concepts on the basis of their ASTM definitions and explains the mathematical relationships between them. The practical importance is illustrated with numerical examples.

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