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Handbook of the Speed of Sound in Real Gases
Volume III is dedicated to the speed of sound in air, a gas mixture that will serve as a model for predicting the speed of sound in other gas mixtures. The underlying principles for predicting the sound speed of individual gases generally apply to gas mixtures, but the property data for individual gases are adequate to determine only some properties of the mixture, like specific heat ratio and molar mass, but inadequate to determine others, like compressibility and relaxation. In the latter cases interaction terms are needed, which generally are of limited availability and then over only a limited range. Further, relaxation in air is based on an ad hoc theory that has not been applied, to the author’s knowledge, to other gas mixtures in most cases the treatment of Chapter 5 will serve as an alternative. This volume contains theory, measurements, and sound speed tables for air over wide ranges of temperature, pressure, humidity, and frequency. It can be read as a ‘‘stand-alone’’ volume, for the reader will find the necessary formulas and gas data without having to refer to the previous volumes. The closing chapter is a historical survey of the speed of sound in air by George S. K. Wong.