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Title: Gravity Balance And Gravitometer
Author: E. P, Goodenough
Source: 1941 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1941
Abstract: The subject of the specific gravity and instruments for determining the specific gravity of gas is primarily of interest, because of its bearing upon the measurement of gas by the orifice meter. In its original form the fo:mula, for the flow of gas through an orifice in a pipeline, included the density of the gas being measured. Density is defined as the quantity (mass) of a substance per unit volume. In the English or Engineering System of Units, the densities are commonly expressed in pounds per cubic foot, while in metric units, densities are expressed in grams per cubic centimeter. The specific gravity of a substance is the ratio of the density of the substance to that of a second substance which is taken as a standard. For gases, air is generally used as the reference standard. The air and gas must be compared under the same conditions of pressure and temperature.

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