A study of the drying of thin layers of polymer solution containing polyvinyl acetate, toluene, and nitrogen is being investigated. During the drying of PVAc-toluene, bubbles can appear well below the boiling point of the toluene-PVAc solution. Therefore, we believe nitrogen dissolved in the solution can become supersaturated during the drying process and create bubbles in the film. The saturation curve of nitrogen was defined by using the Group-Contribution, Lattice-Fluid Equation of State to correlate the experimental data. Also a drying curve of nitrogen concentration was obtained by solving a pair of diffusion equations for solvent and gas in the film by using the free volume theory of Vrentas and Duda. By comparing the saturation and drying curves one can predict whether bubbles will form or not. The result of simulation shows bubble formation does not occur at 40°C. In the future, we wish to correlate the GCLF-EoS at different temperatures and concentrations and develop a prediction model in diffusion of multicomponent systems.