Correction for the weight of an American Football
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How heavy is 6.40 pounds?
It's about seven times as heavy as an American Football
The weight of an American Football is about 0.906250 pounds.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.8750 pounds and 0.93750 pounds. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.