Applications ranging from food production to the treatment of wastewater polluted by PFAS chemicals that are not decomposed naturally use bubble or droplet dispersions1,3. When two immersed bubbles touch, they experience a repulsive interaction, as if they were elastic objects. Depending on the composition and physico-chemistry of the surrounding solution, they can also stick to each other. It has been proposed that ionic correlations at the nanometer scale in the thin liquid films separating bubbles can produce such an adhesion4. Immersed bubbles can thus behave as elastic as well as adhesive objects, but the laws relating the interaction force to the displacement are qualitatively different from those for adhesive soft solid spheres (Hertz law, JKR model). This is because the potential energy of a deformed bubble is stored in its interfaces, in contrast to a solid sphere where it is stored in the bulk material. The interaction law for adhesive bubbles is not yet well known or predicted theoretically. The aim of the internship is to provide experimental evidence helping to answer this open question, using microfluidics, videomicroscopy and a dedicated experimental device constructed in the Laboratory INSP.