Abstract
A series of measurements of falling velocities of glass sphere in an aqueous solution of sodium dodecyl sulfate and in pure water were carried out to elucidate the decrease in ascending velocity of air bubble in water due to the presence of surface active substance. From this, it was confirmed experimentally that the air bubble rises as a sphere and the air circulation inside the bubble is the sole factor in increasing rising velocity in the region of bubble radius from 0.03 to 0.07 cm, and that the circulation is actually suppressed by the adsorption of surface active substance.
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