The authors have modified a tonometer previously used for average molecular weights determination of complex mixtures in order to measure vapor-liquid equilibria of pure compounds and mixtures. Two binary systems with components of different volatility have been studied within the pressure range 133(2) less than or equal to P (Pa) less than or equal to 200000 and mole fraction range : 0 less than or equal to x less than or equal to 1. The two binary systems studied are benzene + n-tetradecane and benzene + squalane. The experimental data (x(i), P-total) have been reduced by Barker's method using a Redlich-Kister expansion in order to evaluate the excess Gibbs energy G(E) and the vapor phase composition y(i). The excess enthalpy H-E has been estimated from the G(E) values. For the binary mixture benzene + n-C-14, our experimental results are in good agreement with Literature data (relative error less than or equal to 2% for P and H-E). Excess volumes of the two binary systems are also reported.