The paper presents the model of liquid-vapour equilibrium for binary mixtures under isothermal requirements; based on minimization of excess Gibbs energy regarding the parameter of salvation. The mathematical model for activity coefficients allows to spot parameters of azeotropic points and to construct the diagram of liquid-vapour phase equilibrium. The method can be applied to mixtu... https://chefesquipmenters.shop/product-category/espresso-machine-parts/