If two soap bubbles of different radii are in communication with each other then
the air flows from the larger into the smaller bubble until the radius of the smaller one becomes equal to that of the larger one and of the larger one equal to that of the smaller one.
air flows from the larger bubble into the smaller one until the two bubbles are of equal size
the size of the bubbles remains the same
air flows from the smaller bubble into the larger one and the larger one grows at the expense of the smaller one
