How big is a bowling ball?
Regulation ten-pin bowling balls must weigh no more than 16 pounds (7.2 kg) (governing bodies do not regulate how light a bowling ball may be) and have a diameter of 8.5 inches (21.6 cm). The lightest ball generally available is the six pound weight, which is used mainly by children. Ball weights between 12 and 16 are common in adult league play. Since the physical size of regulation balls is the same, while the weight may differ, lighter balls are much less dense than heavier ones. Thus, balls under 10 pounds will actually float when placed in water. The website below will overall help with your project.