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0.00273 megatonnes is about 15,000,000 times as heavy as a Billiard Ball
In other words, it's 16,747,463.6734530 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.0000000597105340544870 times that amount.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. 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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