The densities of the ternary systems {1-butyl-3-methylimidazolium methyl sulfate ([BMIM](+)[MeSO(4)](-)) + methanol or ethanol or 1-propanol + nitromethane} were measured at the temperature 298.15 K, and the ternary excess molar. volumes, V(123)(E), were calculated. The V(123)(E) values are negative for all mole fractions of the ionic liquid (IL) and increase with increasing mole fraction of IL. The Cibulka equation was used to correlate the ternary excess molar volumes using the Redlich-Kister parameters for the binary systems obtained from the literature. There is a good correlation between the Cibulka equation and the experimental V(123)(E) data.