The aim of the internship is to study the drainage of bubbles formed on the surface of mixtures of miscible liquids. The lifetimes of bubbles in mixtures is larger by up to four orders of magnitude than in a pure liquid. We have recently shown that this effect results from a surface elasticity induced by small concentration differences in the mixture and that this effect could be quantitatively described by solving the coupled equations for velocity and concentration fields established from thermodynamics of ideal solutions and hydrodynamics. These model systems open up a new avenue for investigating coalescence phenomena which are poorly understood at the present time.