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391 deciliters is about seven-and-a-half times as big as a Bowling Ball
In other words, it's 7.4202785416 times the size of a Bowling Ball, and the size of a Bowling Ball is 0.13476583047 times that amount.
(USBC specifications; tenpin)
According to United States Bowling Congress specifications, a tenpin bowling ball should measure at least 10.795 cm (4.25 in) in radius for a total volume of about 52.6934397150 deciliters. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
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