Is 0.015 stones as heavy as a Billiard Ball?
It's about three-fifths as heavy as a Billiard Ball
The weight of a Billiard Ball is about 0.025669642857143 stones.
(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.024553571428571 stones and 0.026785714285714 stones. 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.
There's more! See other comparisons to 0.015 stones...