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Correction for the weight of a Billiard Ball

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How heavy is 497.810 slugs?
It's about 45,000 times as heavy as a Billiard Ball
The weight of a Billiard Ball is about 0.011169716465769 slugs.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.010684076619431 slugs and 0.011655356312107 slugs. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
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