Tennis balls are sold in pressurized cans so the air stays in the tennis balls. After every hit, a tiny bit of air will leave the tennis ball (also when just lying around).
A sealed pocket of Air is inside the hollow center of a table tennis ball.
A sealed pocket of Air is inside the hollow center of a table tennis ball.
According to Gamma Sports the very first tennis balls were pressureless tennis balls and were created in the 1860's as a result of the recent discovery of vulcanization. It wasn't until 1922 that Penn created the pressurized tennis ball that we use today.
b/c the air particles in the ball are moving faster, causing it to b slightly more pressurized
A tennis ball is essentially a pressurized rubber ball covered with cloth. The rubber is not completely impermeable, however, and slowly leaks over time, just like a latex balloon eventually loses its air. Also, the rubber loses some of its elasticity, although that effect is probably negligible, inasmuch as even unused tennis balls that have been removed from their pressure pack become "dead."
The canister is actually pressurized to balance the pressure inside the container with the pressure inside the tennis balls. This will prevent the balls from going flat. The pressure inside the balls is 12 psi over the normal air pressure (for comparison, the pressure in a car tire might be something like 32 psi). The rubber shell of a tennis ball isn't enough by itself to keep the ball bouncing high, so the pressurized air inside the ball makes it springier. Even though the rubber shell may seem impermeable to air, it isn't. It slowly lets out air until the pressure inside the ball equals the air pressure around it. The pressurized can prevents this from happening until it's opened.
Yes, temperature does affect the air inside a tennis ball. When the temperature increases, the air molecules inside the tennis ball expand and create higher pressure, causing the ball to be more bouncy. Conversely, when the temperature decreases, the air molecules contract, leading to lower pressure and reduced bounce.
a tennis ball
A tennis ball.
A tennis ball.
Its a fat foot ball tennis ball my balls bounce the highest