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15.50 gallons is about eight-and-a-half times as big as a Basketball
In other words, it's 8.25902205590 times the size of a Basketball, and the size of a Basketball is 0.121079710560 times that amount.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 1.87673551360 gallons. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
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