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40 tablespoons is about four times as big as a Tennis Ball
In other words, it's 3.7550 times the size of a Tennis Ball, and the size of a Tennis Ball is 0.26630 times that amount.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must measure 6.54 cm to 6.86 cm in diameter, for a total volume of 10.650 tablespoons. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
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