If a ping pong ball is dented, why does it become round again when we put it in
hot water?
Now, the simple reason is because air expands when it is hot. So, when you put the ping pong ball into the hot water, the air inside the ball expands and pushes out the dents!
Do go read up more about how air expands and what actually happens when air expands. Have fun!!
Thanks for the question, keep them coming!!
The video below shows how to inflat a dented ping pong.
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