Across
- 2. the amount of space something takes up
- 5. to come together or get closer
- 6. this happens to the space between particles when they lose energy
- 7. object that takes up space and has mass
- 8. a measure of the total kinetic energy of a substance
- 10. this theory says that all matter is made up of particles in motion
- 12. the building block of matter
Down
- 1. energy, the energy of motion
- 3. this happens to the space between particles when they gain energy
- 4. the amount of matter in an object
- 9. the average kinetic energy of a substance
- 11. to spread out or get further apart