Is 681 centiliters as big as a Baseball (packed)?
It's about twenty-and-a-half times as big as a Baseball (packed)
The size of a Baseball (packed) is about 32.8710230 centiliters.
(64% packing density) (MLB rules)
Per Major League Baseball rules, a baseball must measure between about 20.1733340 centiliters and 21.9015750 centiliters. A major league pitcher can throw a fastball at up to 150 kph (91 mph).
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