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Correction for the size of a Basketball

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How big is 20 liters?
It's about three times as big as a Basketball
The size of a Basketball is about 7.10421672870 liters.
(NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball and measures about 7.10421672870 liters. The surface of these balls have 4,118 pebbles with a diameter of 2.5 mm each.
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