| Term | Definition |
| Solids, liquids and gases | The states of matter |
| Melting | Solid to liquid |
| Evaporating | Liquid to gas |
| Freezing | Liquid to solid |
| Condensing | Gas to liquid |
| Sublimating | Solid to gas |
| Reverse subliming | Gas to solid |
| Mass / Volume | Density |
| Expanding | What happens when matter gets hotter |
| Contracting | What happens when matter gets colder |
| Energy transfers | Conduction, convection and radiation |
| Temperature | Average kinetic energy of particles |
| Diffusing | Gradual mixing of particles from vibration |
| Solvent | What something dissolves in |
| Solute | The particles that dissolve |
| Solution | The mixture after dissolving |
| Dissolving | Particles separating to mix with others |
| Temperature | Increase in vibration shows on graph |
| Changing state | No extra vibration on graph, just breaking bonds |
| Exploding | Air pressure is greater inside than outside |
| Imploding | Air pressure is greater outside than inside |
| Convection | The way heat travels in any fluid |