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Title: Fundamental Gas Laws
Author: E. F. Dawson
Source: 1934 Appalachian Gas Measurement Short Course
Year Published: 1934
Abstract: There are certain fundamental laws that govern the action of gases which should be understood before the more complicated formulas encountered in the gas industry can be mastered. Before taking up the fundamental laws, the only ones to be considered in this paper, some of the terms used will be explained. When we refer to the temperature of any substance we mean thermal condition which determines the tendency of this substance to give or receive heat from other bodies. The common measure of temperature as used is on the Fahrenheit scale, however as a basis for working problems where gases are involved absolute temperature must be used. The pressure of the gas means the force exerted by this gas on each unit of area of the surface of the container. Absolute pressure is used in all calculations, but gage pressure is the value read on the ordinary pressure gage. Absolute pressures that are greater than atmosphere are equal to the gage pressure plus the atmospheric pressure, all, of course being expressed in the same unit. Atmospheric pressure often varies widely from day to day and place to place, hence its value should always be determined at the place and time needed, a mercury barometer being generally used for that purpose.

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