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Title: Theory And Application Of Thermometers And Pressure Guages In Gas Measurement
Author: Jack T. Teed
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: Due to present day gas accounting procedures based on accepted standards, it has become increasingly important to those engaged in gas measurcinent that they know the basic concepts surrounding the physical characteristics and conditions of gases. Lets briefly discuss them. When subjected to a change in pressure the volume of any substance is changed, but the change in volume of a solid or liquid is usually very small. However, in the case of gas, a change in pressure results in a considerable change in volume. Since, by defintion, the pressure coefficient of a gas is the fractional change in pressure per degree change in temperature at a constant volume temperature must be considered in direct volumetric measurement of gases. This presents three basic measurable quantities, pressure, temperature, and volume which can be used to state the physical condition of a gas.

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