Densities, relative permittivities, excess volumes, and excess molar polarizations for alkyl ester (methyl propanoate, methyl butanoate, ethyl propanoate, and ethyl butanoate) plus hydrocarbons (n-heptane, benzene, chlorobenzene, and 1,1,2,2-tetrachloroethane) at 308.15 K and 318.15 K

New experimental values of density and relative permittivity for alkyl eate rs (methyl propanoate, methyl butanoate, ethyl propanoate, ethyl butanoate) + n-heptane, + benzene, + chlorobenzene, and + 1,1,2,2-tetrachloroethane a re reported at 308.15 K and 318.15 K. The relative permittivities calcuated from the measured capacitances have an uncertainty of +/-0.1%. The excess volumes and relative permittivity deviation are calculated from the density and relative permittivity data. The molar and excess molar polarizations a re obtained from the combination of permittivity and density data for all t he mixtures at both temperatures. The results are analyzed in terms of mole cular interactions.