A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Determine the best reason for this occurrence.
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This is because the ping pong ball is heated. When a substance is heated it undergoes thermal expansion. When the ball expands to a certain limit the ping pong ball obtains its original shape which is when we hear the pop sound. To make the ping pong ball go back to its original size you have to put it in cool water.
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