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57 fluid drams (ʒ) is about one-and-one-third times as heavy as a Billiard Ball.
In other words, it's 1.35950310559010 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.735562865497060 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 40.1041666666670 fluid drams (ʒ) and 43.750 fluid drams (ʒ). 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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