n this paper surface tension and shear viscosity of CO60 fluid are investigated at extended regions of temperature and pressure by means of an improved equation of state, in which the particles interacting via pair wise interaction of hard sphere plus an attractive suitable linear combination of three Yukawa-tails. The proposed method represented a powerful mathematical technique for the Helmholtz free energy in the series mean-spherical approximation expanded in powers of the inverse temperature to compute the liquid- ...