Estimation of speed of sound in binary mixtures of cyclohexane with benzene, benzaldehyde or cyclohexylamine, and, cyclohexylamine with benzene in the temperature range (293.15–323.15) K employing empirical and theoretical models

492-497Speed of sound in the binary mixtures of cyclohexane with benzene, benzaldehyde or cyclohexylamine, and, that of cyclohexylamine with benzene over the entire composition range and at (293.15, 303.15, 313.15 and 323.15) K has been estimated employing several models, viz., Nomoto model (NM), Van Dael model (VM), Junjie model (JM), Ernst et al. model (EM), Impedance model (IM), Collision factor theory (CFT), Intermolecular free length theory (FLT), and, Prigogine-Flory-Patterson theory (PFPT). <span style="font-size:9.0pt; mso-bidi-font-size:11.0pt" lang="EN-US">The maximum deviations between estimated and experimental speed of sound by different models NM, VDM, JM, EM, IM, CFT, FLT, and PFPT are –24.5, –23.0, 20.2, –48.3, –22.1, –24.9, 25.0, and 24.4 m s-1, respectively. The values of standard percentage deviations for NM, VDM, JM, EM, IM, CFT, FLT, and PFPT models are in the range of 0.3–1.4, 0.3–1.4, 0.3–1.1, 0.3–2.7, 0.5–1.2, 0.2–1.4, 0.4–1.2, and 0.4–1.2%, respectively. Considering the overall results, the FLT model predicts the most accurate values for speed of sound while the EM model gives the least accurate values. </span