Correction for the weight of a Billiard Ball
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How heavy is 101.50 grams?
It's about three-fifths as heavy as a Billiard Ball
The weight of a Billiard Ball is about 163.00975796875 grams.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 155.9223771875 g and 170.09713875 g. 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.