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Is 11 ounces as heavy as a Billiard Ball?

It's about one-and-nine-tenths times as heavy as a Billiard Ball
The weight of a Billiard Ball is about 5.750 ounces.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 5.50 ounces and 6 ounces. 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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