Speed of sound and density data for dilute liquid solutions of cyclic ether 1,4-dioxane with 1-heptanol was obtained using the Anton-Paar DSA 5000 at five temperatures？？？=？(298.15, 303.15, 308.15, 313.15, and 318.15) K at atmospheric pressure. The excess parameters were calculated from experimental data and fitted with a Redlich-Kister polynomial function and concluded the presence of weak molecular interactions. 1. Introduction Cyclic ethers are considered some of the most important chemicals in the industry. Particularly, branched ethers (such as 2-methoxy-2-methylpropane or MTBE, 2-ethoxy-2-methyl-propane or ETBE, 2,2′-oxybis[propane] or DIPE, and 2-methoxy-2-methylbutane or TAME) have extensively been used as oxygenates in gasoline production. Cyclic ethers, in turn (e.g., 1,3-dioxolane, 1,4-dioxane, 1,3,5-trioxane, tetrahydrofuran, and tetrahydropyran), are frequently used as solvents in chemical and electrochemical processes, likewise as basic reagents (i.e., monomer) for ring-opening polymerization, and for the production of other chemical intermediaries. 1-Heptanol is often utilized in cardiac electrophysiology experiments to block gap junctions and increase axial resistance between myocytes. Increasing axial resistance will decrease conduction velocity and increase the heart’s condition to reentrant excitation and sustained arrhythmias. It has a pleasant smell and is employed in cosmetics for its fragrance. Speeds of sound and deviations in isentropic compressibilities have been previously reported by the author in their earlier studies on 1,4-dioxane + 1-butanol [1] at five temperatures = (298.15, 303.15, 308.15, 313.15 and 318.15)？K. In the continuation of investigation on excess thermodynamics functions of cyclic ethers in polar and non-polar solvents, authors are reporting the experimental values, deviations in isentropic compressibility (), excess molar volumes (), excess free length (), excess acoustic impedance (), and excess sound velocity () for the binary system 1,4-dioxane + 1-heptanol. The parameters are estimated using standard equations that are reported by many authors [2–5]. These excess parameters are discussed in the focus of intermolecular interactions present in the mixture at = (298.15, 303.15, 308.15, 313.15, and 318.15)？K using Anton-Paar. At the end for the best fit of the result Redlich-Kister coefficients and their related standard deviations are enclosed. 2. Experimental Procedure In the present study the chemicals 1,4-dioxane and 1-heptanol are purchased from Sigma Aldrich chemical company, their mass fraction
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