Correction for the size of a Basketball (packed)
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How big is 0.06 firkins?
It's about one-fifth as big as a Basketball (packed)
The size of a Basketball (packed) is about 0.325822137790 firkins.
(64% packing density) (NBA official ball standards, Size 7)
A NBA official ball, manufactured by Spalding, is a Size 7 ball measures about 0.208526168180 firkins. These balls have 4,118 pebbles each with a diameter of 2.5 mm