Correction for the size of a Baseball (packed)
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How big is 21.70 cubic inches?
It's about one-and-one-tenth times as big as a Baseball (packed)
The size of a Baseball (packed) is about 20.059129 cubic inches.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 12.3105240 cubic inches and 13.3651610 cubic inches. A major league pitcher can throw a fastball at up to 150 kph (91 mph).