A new equation of state intended to be used for representing the thermodynamic properties of liquids at high pressure has been developed. The complete expression is based on an isothermal equation suggested by our group; the temperature dependencies of the characteristic parameters are obtained from their limiting behavior at a pseudospinodal curve using accurate experimental data from literature. The equation of state has been subsequently applied to liquid toluene, and the following thermodynamic properties have been calculated as functions of pressure and temperature : isothermal compressibility, thermal expansion coefficient, thermal pressure coefficient, and isobaric heat capacity. The comparison with experimental results from literature appears to be very satisfactory, and the possibility of using the equation of state for extrapolation is discussed.