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Title: Instruments For The Determination Of Specific Gravity Of Gas
Author: Marsha C. Yon
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: The term specific gravity was replaced by the term relative density by the American Gas Association in 1985. By definition, the term is dimensionless, although it is normally referred to in specific gravity units (SGU). This paper uses the outdated term specific gravity as it is currently better recognized by gas industry personnel. The earliest definition of specific gravity was the ratio of gas density to air density when both are at the same temperature and pressure this is now called real specific gravity. Ideal specific gravity is defined as the ratio of the molecular weight of the gas to the molecular weight of air. Gas gravitometers that are calibrated with reference gases may be used to obtain either real or ideal specific gravity. The value assigned to the reference gases used in the calibration is the only determining factor.

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