Two distinct systems of movement may arise following the attachment of a bubble on a surface that contains a dry spot provided that the force of buoyancy prevails over the impeding surface tension forces. As a general rule, there is a crawling movement followed by the motion of the bubble on a wetting layer that disconnects it from a solid surface. The disturbance of the state of equilibrium leads to the development of a wetting layer. This disturbance may be as a result of joining of the triple line due to a chemical contamination or a surface default at the tip of the bubble leading to the distortion of the bubble and a decline in the extent of the surface tension force. Thereafter, the least velocity required for the formation of the liquid layer is attained causing the bubble to slither on the layer. It is realized that the speed of a moving bubble on a wetting layer surpasses the terminal velocity of a crawling bubble by one order of magnitude . For crawling bubbles at a specified angle of inclination, larger bubbles exhibit slower velocities and vice versa. When the volume of the bubble surpasses a given value, the bubble can move on the entire surface of the wetting layer.
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