Novel data and a group contribution method for the prediction of the speed of sound and isentropic compressibility of pure fatty acids methyl and ethyl esters

► Speed of sound measurements in FAME and FAAE are reported. ► Data are new. ► A group contribution was proposed to predict speed of sound and compressibility of pure fatty acid methyl and ethyl esters. ► The accuracy of the prediction method in very good (in the range of the experimental uncertainty). ► The group contribution can be used to determine the acoustic properties of all FAME and FAAE present in biodiesels.