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Title: Determination Of Specific Gravity
Author: W. A. Brewster
Source: 1944 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1944
Abstract: Before discussing the methods, or the types of instruments, used for determining specific gravity, it is necessary to understand what specific gravity really means and why the correct determination of it is essential to good gas measurement. In physics the density of a substance is a phrase used to denote the ratio of the mass of that body to its volume, in Mass the form of an equation, then Density Volume Thus specific gravity may be defined as the ratio of the density of a substance to the density of some other substance chosen as the standard- In the gas Industry the accepted standard is dry air at a pressure of 30 Mercury and at a temperature of 60 F.

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