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Title: Relative Density Specific( Gravity) Measurement
Author: Timothy Oneill
Source: 1994 International School of Hydrocarbon Measurement
Year Published: 1994
Abstract: Relative density is one of me fundamental physical properties of a gas that derives from the composition of the gas and does not change unless the composition is changed by mixing with other gases or undergoing a chemical change. Relative density does not change with change in temperature and pressure. Relative density is measured because it provides a general totalized description of the gas composition and therefore its physical properties, quality and value. The relative density value is important because it is used as a factor in calculations for flow rate using orifice meters and for custody transfer.