Abstract <p>Studying the patterns of changes in the concentration of components in droplets of binary solutions is critically important for optimization of processes in various industries, including chemistry, pharmaceuticals, and materials science; in designing various types of engines; and in evaporative cooling systems with complex compositions of reacting sprays. This article presents the results of an experimental study of the dynamics of volatile component escape from pendant droplets of aqueous solutions of ethanol, methanol, and acetone in an air flow. The concentration measurements were performed by the capacitance method. The method is based on the dependence of the probe capacitance on the solution permittivity, which is an additive value of the dielectric permittivities of the liquids constituting the solution, the change in the droplet volume during its evaporation taken into account. It is shown that, with an acceptable measurement error, the capacitance method can be used for determination of the concentration of components in a binary mixture droplet with diameter ranging from 1.5 to 3 mm. The experiments have shown that, at identical parameters of the flow around the droplet, the time of complete evaporation of the volatile component was determined by its initial content; the patterns of concentration change in aqueous solutions of acetone, methanol, and ethanol are the same, and, under equal external conditions, are described by a second-order curve. It has been shown that experimental data obtained at different air flow velocities can be generalized through the homochronicity criterion. For a more complete generalization of the experiments, it is necessary to present them in dependence on a complex that includes both the parameters of the ambient medium and the physical properties of liquids under study.</p>