Q: This ping-pong is dented! Do i have to throw it away?
A: No, you can put it in hot water.The air in the ping-pong ball will expand and the dent on the ball will be gone.
When a dented ping-pong ball is placed in a bowl of hot water, the air in the ping-pong ball will absorb heat and expand. As the air expand, it will push the dent outward making the ball return to its original shape.
Give another example of the expansion and contraction of matter in every day life.
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