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Title: Methods Of Determining The Specific Gravity Of Gas
Author: Ira J. Mead
Source: 1962 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1962
Abstract: Before going into a discussion of the methods of determining the specific gravity of a gas, it would be well to refer to the definition of specific gravity. By definition, the specific gravity of a gas is the ratio of 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 and pressure. This can be stated in another way by saying the specific gravity is the ratio of the density of a gas to the density of air when both densities are determined at the same conditions of temperature and pressure. Thus it is seen that while density varies according to the conditions under which it is determined specific gravity, on the other hand, is a constant value, using air at unity as a standard of comparison

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