Particle model word list

3. The body of theory which explains the physical properties of matter in terms of the motions of its constituent particles.
4. The process when something cools down or starts to get colder
7. A particle that makes up everything in the world.
8. A particular type of matter with uniform properties.
11. One of the three states of matter that is runny.
12. The quality or condition of being hard.
13. The process of liquid turning to vapour.
15. The point when a liquid turns to gas.
16. A three-dimensional representation of a person or thing or of a proposed structure, typically on a smaller scale than the original.
19. The resistance of a material to breaking under tension.
20. A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
21. The degree of compactness of a substance.

1. Physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
2. The gooiness of a substance/liquid.
5. One of the three states of matter that's particles are flying around.
6. One of the three states of matter that's particle s vibrate.
9. Water which collects as droplets on a cold surface when humid air is in contact with it.
10. The spreading of something more widely.
14. A minute portion of matter
17. The process when a substance heats up or starts to get hot.
18. The strength and vitality required for sustained physical or mental activity.