Acoustic cavity method for phase boundary determinations: The critical temperature of CO2

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Abstract
A versatile acoustic method for the determination of points on phase boundaries in a fluid system is shown to be not only precise, but also capable of producing numerous experimental points in a short time as compared to other methods. The present method using a spherical acoustic resonator assembly operating under microcomputer control is capable of detecting any kind of chemical or physical changes which take place in the constant volume system as the temperature is slowly varied. Results on its use to locate the critical point of CO2 are given.