Glossary of key terms

1. material that can flow. This can either be a liquid or gas
5. the change in state when a liquid changes into a solid
9. scientists who use observations of the atmosphere to predict or explain the weather
11. falling water in solid or liquid form. The type of precipitation depends mostly on the temperature in the clouds and the air around them.
12. point the temperature at which a solid substance turns into a liquid (melts) or a liquid turns into a solid (freezes)
13. state of matter that has a fixed volume, but no fixed shape
16. the change in state from a solid into a gas without first becoming a liquid
17. point the temperature at which a liquid changes to a gas
18. the change in state when a solid changes into a liquid
20. increase in size due to particles moving apart
23. a condition caused by not having enough oxygen
25. the amount of space taken up by an object or substance
26. having a thick or sticky consistency
28. state of matter with no fixed shape or volume
29. relates to motion
31. of attraction the forces between particles in all substances. It is greatest in solids.
33. the force exerted per unit area
34. the quantity of matter in an object (usually measured in grams or kilograms)

2. the change in state from a gas into a solid without first becoming a liquid
3. the qualities and characteristics of materials and the substances that they are composed of
4. vapour water in the gaseous state
6. the change in state when a liquid changes into a gas. Evaporation occurs only from the surface of a liquid.
7. material that can flow. This can either be a liquid or gas
8. state of matter that has a fixed shape and volume
10. of matter condition or phase of a substance. The three main states of matter are solid, liquid and gas.
11. falling water in solid or liquid form. The type of precipitation depends mostly on the temperature in the clouds and the air around them.
14. mass per unit volume
15. model a description of the moving particles that make up all matter and how they behave; explains the properties of solids, liquids and gases
19. a measure of how hot or cold something is
21. superheated, charged gas that is the fourth state of matter
22. movement of one substance through another due to a movement of particles, for example from a region of higher concentration to lower concentration
24. the capacity of something to be reduced in size due to pressure. Solids cannot be compressed, gases can be.
27. everything that takes up space and has mass is matter
30. shorten or become smaller in size
32. the change in state when a gas changes into a liquid