To illustrate the experimental results taken with the single-sinker densimeter, the following figure shows the investigated pρT surface of ethane as a typical example.

In the second figure, a a brief comparison of the measurements with the single-sinker densimeter with experimental results of other investigators is presented for three representative isotherms. This figure illustrates the small uncertainty of the measurements with the single-sinker densimeter. The zero line in the three diagrams corresponds to values calculated from a preliminary equation of state for ethane. The measurements with the single-sinker densimeter are represented by full circles (•) and their uncetainty of ≤0.02% to ≤0.03% is illustrated by the yellow areas. The two upper diagrams show that the results taken with the single-sinker densimeter of Claus et al. (2003) agree very well with the reference measurements of Funke et al. (2002), taken with the two-sinker densimeter in the overlapping region for temperatures from 240 K to 340 K at pressures up to 12 MPa. The experimental results of ten other studies show systematic deviations from the accurate measurements with the single-sinker densimeter of up to ±0.2% and more than that.

This example illustrates the wide operating range and the high accuracy of the single-sinker densimeter.