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Is vacuum matter? What are ten things that are not matter?

Vacuum, by definition, is the absence of matter. Matter, of course, is something that has mass and occupies space. Here is my top ten list of "Things That Are Not Matter":

1. Light
2. Sound
3. Heat
4. Energy
5. Gravity
6. Time
7. A Rainbow
8. Love
9. Happiness
10. A really good joke


Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)

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