Con respecto a las bombas de 500 libras, en realidad 500 Libras es el peso nominal pero puede variar de acuerdo a la función de la bomba.
With a nominal weight of 500 lb (227 kg), it is the smallest of those bombs in current service, and one of the most common air-dropped weapons in the world. Although the Mk 82's nominal weight is 500 lb (227 kg), its actual weight varies considerably depending on its configuration, from 510 lb (232 kg) to 570 lb (259 kg). It is a streamlined steel casing containing 192 lb (87 kg) of Tritonal high explosive.