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The speeds of sound has been obtained at a frequency of 4 MHz in diethylene glycol dimethyl ether + methanol, + ethanol, + 1-butanol, and + 1-pentanol across the entire composition range, at the temperature 298.15 K and atmospheric pressure using a NUSONIC velocimeter based on the sing-around technique. The ultrasonic speed values have been combined with those of the excess molar volumes converted to densities to obtain estimates of the product K S,m  of the molar volumes and isentropic compressibility κ S , and excess quantity K E  S,m . The K E  S,m  values are negative over the entire range of composition for all mixtures with the exception of 1-pentanol, which changes sign from positive to negative. The magnitude of K E  S,m  increase with the number of carbon atoms in the n-alcohol. The deviations of the speeds of sound u D  from their ideal values u id  in an ideal mixture were also calculated for all measured mole fractions. The behaviour of u, u D , and K E  S,m  with composition and the number of carbon atoms in the alcohol molecule is discussed.

Speeds of Sound and Isentropic Compressibilities of Diethylene Glycol Dimethyl Ether - n-Alcohol Mixtures at 298.15 K