An automated calorimeter for the measurement of isobaric expansivities and of isothermal compressibilities of liquids by scanning pressure from 0.1 to 400 MPa at temperatures between 303 and 503 K

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A pressure-scanning calorimeter operating in the pressure range from 0.1 to 400 MPa at temperatures from 303 to 503 K is described. Information collection from, and control of, the calorimeter is done with a computer and a stepping motor. The calorimeter was tested by determining the isobaric expansivity of n-hexane over nearly the entire range of accessible pressures and temperatures. Expansivities for a mixture of n-hexane and hexane isomers are also presented. The sample cell and pressurizing equipment associated with the calorimeter can also be used to determine the compressibilities of liquids near room temperature. A method for calibration of the system for this purpose is demonstrated by use of n-hexane as a calibrating fluid.