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Title: Methods Of Determining The Specific Gravity Of Gas
Author: James W. Wood
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: The specific gravity of gas is a property which must be known to calculate gas volumes metered through orifice type meters. The term specific gravity does not mean the same thing as density. The specific gravity of a gas is an abstract number and the density of a substance is a concrete number. By definition, the specific gravity of a gas is the ratio of the weight of a given volume of the gas at a definite temperature and pressure to the weight of an equal volume of air (dry and carbon dioxide free) at the same temperature. Specific gravity can also be defined as the ratio of the density of a gas to the density of air when both densities are obtained at the same conditions of pressure and temperature. While density varies according to the conditions under which it is determined, specific gravity is a constant value, when using dry, carbon dioxide free air at unity as the standard. The specific gravities of some common gases which may be components in natural gas are given in the following table:

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