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Imagine this: On the gymnasium floor, you have it completely covered with basketballs. There is no space in between the balls. That represents wood. It is solid with the atom in contact with each other. Compare that to the same number of ping-pong balls covering the floor. They represent the molecules of gas in the air. They all have lots of empty space around them.

With those two models in your mind, start an energy wave moving through the tightly packed basketballs by kicking one of them on the edge of the floor. The energy wave is propagated almost immediately through the rest of the balls to the other side. Now, try the same with the ping-pong balls. Not only do you have to put more power into your kick to get them moving but the energy wave has to "wait" as the balls roll through the empty space surrounding them.

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11y ago
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