Q:

# Does a hot tennis ball bounce higher?

A:

Because higher temperatures result in higher pressure, a tennis ball bounces higher when it is hot. When the gas molecules expand in the tennis ball, it causes more energy and a higher bounce.

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When the temperatures decreases, it has the opposite effect on the tennis ball's bounce. The gas molecules contract and move around much more slowly. In the winter season, tennis players often string their rackets 2 pounds lower to compensate for the change in pressure in the tennis ball. A fully inflated tennis ball often appears deflated or softer if there is a sudden change in temperature outside.

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## Related Questions

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A Six's thermometer functions by using alcohol to expand or contract the mercury inside to display both the highest and lowest temperatures of a given time period. There are bulbs at the top of each arm of the tube, one above each indicator. The bulb above the minimum indicator tube typically contains alcohol while the bulb atop the maximum indicator tube contains a vacuum.

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