| A | B |
| relative density | objects that are more dense sink in water; less dense objects float in water |
| classify | group together based on similar traits |
| solubility | Measurement of the ability of a solid to dissolve in a liquid |
| physical state | The classification of matter as a solid, liquid, or a gas |
| solid | A state of matter that has a fixed shape and volume |
| liquid | A state of matter that has a fixed volume, but its shape changes to match the shape of its container. |
| gas | A state of matter that does not have a fixed volume or shape. |
| matter | Anything that has mass and takes up space |
| mass | The amount of matter in an object. |
| properties | Appearances of an object including: mass, magnetism, physical state, relative density, solubility, and the ability to insulate or conduct heat or electricity |
| freezing point | The temperature at which a substance changes states from a liquid to a solid (freezing point of water is 0 degrees Celsius). |
| melting point | The temperature at which a substance changes states from a solid to a liquid |
| boiling point | The temperature at which a substance changes states from a liquid to a gas (the boiling point of water is 100 degrees Celsius). |
| constant | not changing; the same |