Figure 1

Viscosities $\left(\text{mPa}\text{s}\right)$ are plotted against pressure (GPa) on isotherms of 308, 373, 473, 573, and 673 K. Error bars approximate $1\sigma$ values. Curves are overall fits of the data to Eq. (1) with temperature-dependent coefficients as given in the text.Reuse & Permissions

Figure 2

Viscosities from the literature (vdG [1]; KG [9]; MBS [21]) are plotted against pressure as fractional differences from the overall fit to Eq. (1), $\left({\eta }_{lit}-{\eta }_{calc}\right)/{\eta }_{calc}$. Curves (FWV) represent a formulation [11] which has an estimated uncertainty of 4% above 400 K.Reuse & Permissions

Figure 3

Reduced viscosity $\left({\eta }_{red}\right)$ is plotted against reduced residual entropy $\left(s\right)$. Data are those of Fig. 1 from this study (lighter symbols) and Ref. [1] (vdG, bold symbols); additionally, the formulation of Fenghour et al. [11] is used to give values at the triple point, and two points at 673 and 1000 K extrapolated to pressures beyond their available data (FWV, bold symbols). The straight, solid line is drawn through the 308 K data. The dotted line represents Rosenfeld’s suggestion for a fluid of structureless particles. Shown in the inset are isotherms of density $\left(\text{g}{\text{cm}}^{-3}\right)$ plotted against $s$ for the equation of state used [19] (solid lines); the dashed line represents a suggested 673 K isotherm which would cause the 673 K ${\eta }_{red}$ to fall on the same straight line as the other data in the main figure.Reuse & Permissions