Correction for the size of a Baseball (packed)
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How big is 0.002 firkins?
It's about one-fifth as big as a Baseball (packed)
The size of a Baseball (packed) is about 0.0096484507 firkins.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 0.0059213679 firkins and 0.006428649 firkins. A major league pitcher can throw a fastball at up to 150 kph (91 mph).