Gas bubbles in a fluid can be deduced from an equilibrium state by the change of the external pressure, conduct the periodical radial vibrations (pulsations). Two pulsating in phase bubbles are attracted to each other by the Bjerknes force. However in the vicinity of the contact point the attraction counteracts the repulsion, which appears due to the interaction between Bjerknes force and the force of viscosity. In the case of vibration of a singular bubble as the result of the non-linear interaction between radial and deformational modes at the point of their resonance the energy of radial oscillations transfers to the energy of deformational oscillations with amplitude increase. These effects provide the quantified explanation for the experiments on the convergence and coalescence of pulsating gas bubbles in a fluid.
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