The densities of the mixture {water (1) + 1,4-dioxane (2)} were measured using a vibration density meter at temperatures from 274.15 to 333.15 K and atmospheric pressure over the entire composition range. The excess molar volume of the mixture and the partial molar volumes of water and 1,4-dioxane were calculated. The temperature of the maximum density of 1,4-dioxane aqueous solutions was determined. It is shown that the formation of the mixture occurs with a decrease in volume. The dependences of partial molar volumes on the concentration of water and 1,4-dioxane have extremums. The values of molar volumes of water and 1,4-dioxane exceed the corresponding limit partial molar volumes. An increase in the temperature or concentration of 1,4-dioxane increases the magnitude of the molar expansion of the mixture over the entire range of compositions. Replacing the intrinsic environment of a molecule in a solvate shell with molecules of another component leads to a decrease in the partial molar volume at infinite dilution. The obtained results were compared with the literature data.
