Correction for the size of a Bowling Ball
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How big is 207 gills?
It's about four-and-a-half times as big as a Bowling Ball
The size of a Bowling Ball is about 44.5444291690 gills.
(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 44.5444291690 gills. 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.