where ? and ? are the surface tension in N m−1 and density in kg m−3, respectively. The overall relative deviation of their modelresults was 1.96%. A disadvantage of the proposed model was the lack of experimental data for both the surface tension and density for each of the ILs. As a result, they developed two correlations to predict ? and ?. This meant that a relatively large number of computations were required to use this model to predict SS. The nextand only other study in literature was undertaken by Singh and Singh [8]. They used the same approach as Gardas and Coutinho And developed a model for 3 additional imidazolium-based ILs.