We determined apparent molar volumes V ϕ at 278.15⩽(T/K)⩽368.15 and apparent molar heat capacities C p,ϕ at 278.15⩽(T/K)⩽393.15 at p=0.35MPa for aqueous solutions of tetrahydrofuran at m from (0.016 to 2.5)mol·kg −1 , dimethyl sulfoxide at m from (0.02 to 3.0)mol·kg −1 , 1,4-dioxane at m from (0.015 to 2.0)mol·kg −1 , and 1,2-dimethoxyethane at m from (0.01 to 2.0)mol·kg −1 . Values of V ϕ were determined from densities measured with a vibrating-tube densimeter, and values of C p,ϕ were determined with a twin fixed-cell, differential, temperature-scanning calorimeter. Empirical functions of m and T for each compound were fitted to our V ϕ and C p,ϕ results.