Isotope effect on the viscosity of benzene and cyclohexane mixtures under high pressures

Viscosities of binary mixtures of cyclohexane with protiobenzene, C₆H₆, or deuteriobenzene, C₆D₆, have been measured at 298 and 323 K and at pressures up to 50 MPa using a capillary viscometer. The viscosities of these mixtures obtained were represented by a empirical Tait-type equation within the experimental uncertainty of ±2%. The effect of the isotopic substitution on the viscosity has been discussed.