PVT

Pressure-volume-temperature (p-V-T) data are the most fundamental thermodynamic data. Along the saturation line, p-V-T data constitute the primary thermodynamic data. Equations of state for all of the thermodynamic properties are most often written directly in terms of pressure, temperature, and volume, and comprehensive p-V-T data are the basis for fitting accurate equations of state.

These data are also often required for the interpretation of other measurements; for example, our technique for measuring viscosity yields the viscosity-density product, and, thus, accurate density (volume) data are required to extract viscosity.

We have the following instruments.

• Dual-sinker densimeter

  Burnett apparatus

  Vibrating-tube densimeters

  Isochoric pvT

A sampling of journal articles pubished on this research is given below.

• McLinden, M.O. and Frederick, N.V. (1993). Development of a dual-sinker densimeter for high-accuracy P-V-T measurements. 11th Symposium on Energy Engineering Sciences, May 3-5, Argonne, IL, 63-69.

Contact:
Dr. Mark O. McLinden Dr. Joseph W. Magee NIST Physical and Chemical Properties Division Experimental Properties of Fluids Group Mail Stop 838.07 325 Broadway Boulder, CO 80305-3328 USA	+1-303-497-3580 +1-303-497-3298 +1-303-497-5224

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