The papers discuss the features of clustering in aqueous solutions of ethanol. It is assumed that the volume of an elementary cluster is smaller than the total molecular volumes of the components that make up this cluster. It is justified that the form of the concentration dependence of the cluster parameter. Based on the data on the cluster composition of water-ethanol solutions, the concentration dependence of   was obtained. The value determination accuracy of   does not worse than . Applying the group description of solutions, the concentration dependence of the molar volume of the solution in the concentration range   was obtained. The deviation from experimental data is no more than. Obtained concentration dependence of contraction of aqueous solutions of ethanol at temperatures higher than. These dependences, in contrast to the contraction at temperatures lower than, do not pass through a special point of the solution.