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Title: Methods Of Determining The Specific Gravity Of Gas
Author: B. G. Grant
Source: 1964 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1964
Abstract: If all gases were alike, the problems of the measurement man would not be nearly so complex. But the facts are that we must take into consideration many variables when we work with any gas. This is true even with the most common of all gases which is air. It becomes necessary that we specify what kind of air we are talking about. Even air behaves differently under different conditions. This paper will deal with the methods devised for determining the property of a gas called its specific gravity. In very simple terms the specific gravity of a gas is the ratio of the weight of the gas to the weight of the same volume of air. More precisely, the specific gravity of gas is the ratio of the specific weight of a gas to the specific weight of dry air, the pressure and temperature of both being the same and the air free of carbon dioxide. The most common conditions referred to for air are 60 F, 14.73 p.s.i.a,, and with the air being dry.

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