Oxygen evolving on a tranparent tin‐oxide anode in aqueous potassium hydroxide was photographed by a high‐speed motion‐picture camera capable of 10,000 frames per second. With illumination by fiber optics and use of a microscope, sharp images of the emergence, growth, and coalescence of bubbles were obtained with a resolution as small as 1 μm. Bubbles grew by diffusion of oxygen and by coalescence with other bubbles still attached to the electrode. Detached bubbles in some cases reattached. Coalescing and detaching bubbles caused significant fluid motion close to the electrode surface. Bubbles in general were evolved in a cycle of growth by diffusion and various modes of coalescence.
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Sides et al. (1985) studied this question.