| Term | Definition |
| matter | anything that has mass and takes up space |
| physical property | a characteristic of an object that can be observed or measured without changing the object. Ex: mass, volume, color, state of matter |
| solid | state of matter that has a definite shape and volume. Molecules are tightly packed together. |
| liquid | state of matter that has a definite volume but no definite shape. Molecules are loosely linked. |
| gas | state of matter that has no definite shape and volume. Molecules move freely. |
| plasma | state of matter that occurs when energy such as electricity or heat energy is applied to a gas.-making a "superheated' gas |
| Boiling Point | the temperature at which a substance changes from a liquid to a gas. Ex. Water: 100 degrees C or 212 degrees F |
| Freezing Point | the temperature at which a substance changes from a liquid to a solid. Ex. Water: 0 degrees C or 32 degrees F |
| Melting Point | the temperature at which a substance changes from a solid to a liquid. Ex. Water: 0 degrees C or 32 degrees F |
| Mass | amount of matter in an object |
| Volume | how much space an object takes up |
| Density | the amount of mass in a certain volume of an object |
| Buoyancy | the ability to float |
| Weight | the measurement of the pull of gravity on an object's mass |