Independent Variable- Temperature of the tennis balls

Dependent Variable- How many times the ball will bounce

Control The ball at room temperature

Constant - The height from where the balls are being dropped, , the floor it will bounce on ,they are all the same type of balls

In my science fair experiment my idea was to test which temperature of a tennis ball makes the ball bounce more. I got some tennis balls and I changed the temperature of them then which one would bounce more times. So my hypothesis was if I get 3 tennis balls and I change the temperature of them the cold one will bounce for longer, this was in between a hot ball, a cold ball, and a regular room temperature tennis ball.When I did my experiment the hot ball bounced 15 times in the first and second trial, in the third trial it bounced 14 times. When I tested the normal room temperature ball it bounced 11 times in the first 2 trials, and 10 times in the third trial, and finally for the cold ball it bounced 5 times in the first 2 trials, and 4 times in the last trial. Yes the hot ball won, let me tell you why, the pressure of the gas inside the ball ultimately determines how high the tennis ball will bounce. The scientific equation for determining the pressure of gas is “p=rRT,” where “p” is the pressure, “r” is the density, “R” is a constant specific to the gas, and “T” is temperature. If the density and the constant remain the same, a higher temperature results in higher pressure, while a lower temperature results in lower pressure. When the temperature increases, the gas molecules inside the tennis ball expand. As the molecules expand, their energy increases as they bounce around more erratically. This increased energy and movement results in a higher bounce. On the other hand, a temperature decrease causes the gas molecules to contract and move around more sluggishly. As a result, a cold ball has a much lower bounce. Its really cool right but works weird but still remember a hot ball will bounce for longer than a normal or cold ball.