Tennis balls are affected by the environment in a few ways. The environment can affect how it bounces. Warm air makes the ball expand causing it to have a higher bounce. Cold air makes the ball contract and can make it harder to bounce.
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Just as it affects people, the environment may affect the tennis courts. Regardless of the surface: If it is too cold or dry, the surface will tend to be harder and the tennis balls will bounce higher and faster; if it is too hot or humid, the surface will tend to be softer and the tennis balls will bounce lower and slower. The same is true for the ability of the tennis player to run on that surface during those conditions.