2019/04/22 by Damir I. Sagdeev, Ilgiz R. Gabitov, Chingiz Isyanov +4 · 1 citation
Chemical Engineering · Engineering · Chemistry · #Thermodynamic properties of mixtures #Phase Equilibria and Thermodynamics #Analytical Chemistry and Chromatography #Viscometer #Viscosity #Atmospheric pressure #Hydrostatic equilibrium #Thermodynamics #Oleic acid #Chemistry #Range (aeronautics) #Hydrostatic pressure #Analytical Chemistry (journal) #Hydrostatic weighing #Materials science #Chromatography #Meteorology #Physics
paper · doi:10.1002/aocs.12217
openalex publication_date 2019/04/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/27
Abstract The densities of oleic acid were measured over the temperature range from (293 to 459) K at atmospheric pressure using a densimeter based on the modified hydrostatic weighing method. The dynamic viscosities of the same oleic acid sample were measured using a capillary viscometer (VPZ‐2 m) in the range from (293 to 363) K at atmospheric pressure. The combined expanded uncertainty of the density, atmospheric pressure, viscosity, and temperature measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be 0.15%, 1.0%, 3.5%, and 15 mK, respectively. The values of uncertainty for density and viscosity include the effects of purity and calibration (total expanded uncertainty). These experimental data were used to develop wide‐range correlations for the density and viscosity based on theoretically confirmed Arrhenius–Andrade and Vogel‐Tamman‐Fulcher (VTF) models. The value of the glass temperature ( T g = 179.78 K.) for the oleic acid was estimated using the VTF parameters derived from the present viscosity measurements. To additionally validate the reliability of the measured density data, the same oleic acid samples were measured using the pycnometric method. The present study showed that the densities measured using the modified hydrostatic weighing densimeter (HWD) agree with the values obtained using the pycnometric method within 0.09% for Sample 1 and 0.25% for Sample 2.