* Composition: Tennis balls are primarily made of rubber, which is a polymer. Polymers are large molecules made up of repeating units.
* No Distinct Phase Change: Unlike water which freezes at 0 degrees Celsius (32 degrees Fahrenheit) and melts at the same temperature, rubber doesn't undergo a sharp, distinct phase change from solid to liquid.
* Glass Transition: Instead, rubber exhibits a "glass transition" temperature. At this temperature, the rubber becomes more flexible and rubbery. However, it doesn't completely melt into a liquid. This transition temperature for rubber is usually around -70 to -50 degrees Celsius (-94 to -58 degrees Fahrenheit).
So, what happens to a tennis ball at low temperatures?
* Stiffening: As the temperature drops below the glass transition temperature, the rubber becomes very stiff and brittle. It may crack or break easily.
* No Melting: The rubber won't melt into a liquid, even at extremely low temperatures.
In summary:
* Tennis balls don't have a traditional freezing or melting point.
* They undergo a glass transition, becoming stiff and brittle at low temperatures.
* The rubber will not melt into a liquid, even at extremely low temperatures.
