The motion of injected air bubbles of equivalent diameters between 0.98 mm to 6.25 mm were experimentally studied using photographic recordings. The theoretical analysis formulated for this study showed that the relative velocity of the air bubles approached a state similar to the terminal velocity in still water shortly after being subjected to acceleration. Experimental results conclusively proved the theoretical approach and formulae were therefore developed to express these experimental findings, in accordance with the theoretical and statistical approaches.