| A | B |
|---|
| solid | has a definite volume and a definite shape |
| crystalline solid | has a definite melting point like salt or sugar |
| melting point | temperature at which a substance changes from a solid to a liquid |
| amorphous solid | does not have a definite melting point but gets softer as it is heated |
| liquid | has a definite volume but no definite shape |
| viscosity | resistance of a liquid to flowing |
| gas | has no definite shape and no definite volume |
| temperature | measure of the average energy of motion of the particles of a substance |
| pressure | force exerted on a surface divided by the total area over which the force is exerted |
| Charles's Law | describes the relationship between temperature and pressure of a gas at constant volume |
| Boyle's Law | states the relationship between pressure and volume of a gas at constant temperature |
| graph | diagram that tells how two variables or factors are related |
| directly proportional | relationship between two variables that produces a straight line that passes through (0,0) |
| vary inversely | relationship between two variables that produces a downward curved line from left to right |
| thermal energy | energy that the particles of a substance have |
| melting | change in state from a solid to a liquid |
| freezing | change in state from a liquid to a solid |
| vaporization | change in state from a liquid to a gas |
| evaporation | vaporization only on the surface of a liquid |
| boiling | vaporization that takes place inside a liquid as well as on the surface |
| boiling point | specific temperature at which a liquid boils |
| condensation | change in state from a gas to a liquid due to loss of thermal energy |
| sublimation | change in state from a solid directly to a gas without passing through the liquid state |
