Correction for the weight of a Tennis Ball
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How heavy is 12 grams?
It's about one-fifth as heavy as a Tennis Ball
The weight of a Tennis Ball is about 57.70 grams.
(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 56.0 g to 59.4 g. 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.