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15.50 gallons is about five-and-a-half times as big as a Basketball (packed)
In other words, it's 5.28577411560 times the size of a Basketball (packed), and the size of a Basketball (packed) is 0.189187047750 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 1.87673551360 gallons. These balls have 4,118 pebbles each with a diameter of 2.5 mm
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