Experimental dynamic viscosities of 2,3-dimethylpentane up to 60 MPa and from (303.15 to 353.15) K using a rolling-ball viscometer

The main motivation of this work is to verify the reliability of a high-pressure viscosity measurement technique that was recently installed in our laboratory. A total of 2520 experimental measurements of the rolling time have been performed. Hexane and decane were used to calibrate the apparatus, and the dynamic viscosity of heptane has been measured to verify the calibration method. Our results agree with the literature values with average absolute deviations lower than the experimental uncertainty ( +/- 2%). In a second step, hexane, heptane, and decane have been used as reference substances, and the calibration has been verified again by determining the dynamic viscosity of toluene. A comparison has been established between the expefimental dynamic viscosity measured in this work for toluene and the reference correlation recommended by IUPAC, obtaining an absolute average deviation of 0.9% and a maximum deviation of 2%. Furthermore, 99 density (up to 45 MPa and from 298.15 K to 353.15 K) and 84 dynamic viscosity (up to 60 MPa and at six temperatures ranging from 303.15 K to 353.15 K) measurements of liquid 2,3-dimethylpentane are also reported.