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391 deciliters is about three-and-a-half times as big as a Basketball (packed)
In other words, it's 3.5224150606 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.28389612888 times that amount.
(64% packing density) (NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball measures about 71.042167287 deciliters. These balls have 4,118 pebbles each with a diameter of 2.5 mm
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