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The water activity was evaluated in 39 mixtures of water with 1-propoxypropan-2-ol (1-pp-2-ol) at T=298.15K using an indirect method which measures the system capacitance. A careful calibration of the apparatus and the many measurements in the water very-rich region have enabled the determination of activity coefficients of 1-pp-2-ol using the Gibbs–Duhem equation, the system being modelled using...