Question

what is inside a tennis ball​

Answer 1

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Modern tennis balls are made of a hollow rubber core, covered in a wool or nylon shell which is known as the nap. Pressurised air inside the rubber core makes the ball bounce. Balls which haven't got enough pressure inside make a thud when they hit the floor. These are called dead balls.

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Answer 2

There is thin layer of adhesive on the rubber . it is filled with air or nitrogen.