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Title: Fundamental Principles Of Specific Gravity Determination
Author: P. J. Renner
Source: 1941 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1941
Abstract: The term specific gravity is quite familiar in the dally problems of gas measurement. Yet, it is doubtful if many have considered the fundamental aspects of specific gravity determination. Since the balance method of determining specific gravity has come to be the accepted standard, this discussion will be confined to the fundamentals of that method. A general definition of specific gravity is the ratio of the weight of a given voiume of any substance to ihat of the same volume of some other substance selected as a standard. To avoid the use of unwieldy figures, air has been selected as a standard reference base to express this weight ratio for gases. Thus, s-hen a gas has a specific gravity of .675, it simply means t h a t the gas is 671 per cent as heavy as air. Or i: a gas has a specific gravity of 1.45, the gas is one and forty-five one-liundrcdths times as heavy as air. So it is apparent that the term specific gravity exrresses the weight of a volume of gas in terms of a percentage of the weight of the same volume of air.

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