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Is 0.623689508750 kilograms as heavy as an American Football?

It's about one-and-a-half times as heavy as an American Football
The weight of an American Football is about 0.41106808531250 kilograms.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.396893323750 kilograms and 0.4252428468750 kilograms. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
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