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13 tablespoons is about nine-tenths as as a Baseball.
In other words, it's 0.9137414426 times the of a Baseball, and the of a Baseball is 1.094401494 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 13.64283159 tablespoons and 14.81160726 tablespoons. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.
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