Measurement of the Density of Base Fluids at Pressures to 2.20 GPa

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Abstract
The influence of pressure on the density of six base fluids was experimentally studied for a range of pressures from 0.422 to 2.20 GPa. An important parameter used to describe the results is the change in relative volume with change in pressure dvr/dp. For pressures less than the solidification pressure (p < ps), a small change in pressure resulted in a large change in dvr/dp. For pressures greater than the solidification, pressure (p > ps), there was no change in dr/dp with changing pressure. The solidification pressures of the base fluids varied considerably, as did the slopes that the experimental data assumed, for p < pv. A formula was developed that describes the effect of pressure on density in terms of four constants. These constants vary for the different base fluids tested.