Across
- 2. Amount of space an object or substance occupies.
- 4. A tiny piece that makes up all matter.
- 7. How much mass is packed into a given volume.
- 11. Force that pulls particles together.
- 12. Measure of how hot or cold something is.
- 13. A hot, charged gas made of ions.
- 14. Gas turning into a liquid.
- 18. Energy of moving particles.
- 19. Solid turning directly into a gas.
- 21. Matter that spreads out to fill a space.
Down
- 1. Matter with a fixed shape and volume.
- 3. Matter that flows and takes the shape of its container.
- 5. Liquid turning into gas from the surface.
- 6. Shaking movement of particles, especially in solids.
- 8. Force that particles apply when they hit container walls.
- 9. Needed to make particles move faster.
- 10. Process where a liquid becomes a solid.
- 15. Gas turning directly into a solid.
- 16. The gaps between particles.
- 17. Process where a solid becomes a liquid.
- 20. A scientific idea used to explain how particles behave.