 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the expanding ping pong ball. As always, adult supervision is required. What you need for this experiment is a ping pong ball, a glass, a microwave, water, and an oven mitt. To set this experiment up, you just need a ping pong ball that's been dented. I'm sure we all have those if you've played ping pong. Fill your glass about almost to the top and then put the ping pong ball in and then place in your microwave for a minute or two. I just did one minute and it seemed to work. I guess every dent will be a little bit different and you turn it on and you're not gonna be able to see it very much but it's working in there and I will explain the science behind it. And we go to pull it out. Remember the water is very very hot and so you could just pick up the glass with an oven mitt, bring it down, and we will see the ping pong ball here. Pull it out very carefully and there is no more dent in the ping pong ball. Pretty impressive, right? So I'm gonna do this experiment one more time with the different ping pong balls. I had two ping pong balls with dents in them. This one is perfectly in great shape. Again, here it is with the dent and I'll explain the science behind it. As the ping pong ball is heated, the air inside will also be heated as well. As the molecules of air are heated, they will begin to move faster. As they move faster, they will collide more frequently in the inside walls of the ping pong ball. This will cause the ping pong ball to expand back to its original shape and volume. This is in accordance with Charles Law which states that as the temperature of a gas increases, a volume will increase also. So now you know the science on how to get a dent out of a ping pong ball. I hope you enjoyed this video. Remember to click thumbs up and to subscribe as we do a new video every day. Thanks for watching!