| A | B |
|---|
| solid | definite shape, definite volume |
| liquid | definite volume, not a definite shape |
| gas | no definite shape, no definite volume |
| kinetic energy | energy an object has due to its motion |
| pressure | results of force distributed over an area |
| absolute zero | temperature of 0 Kelvins--not reached yet! |
| Charles's Law | direct proportion: volume to temperature if all is constant |
| Boyle's Law | inverse variation of the volume of a gas with its pressure--all constant |
| phase change | reversible physical change that occurs when a substance changes from one state of matter to another |
| endothermic | change in which a system obsorbs energy from its surroundings |
| heat of fusion | energy a substance must absorb in order to change from a solid to a liquid |
| exothermic | change in which a system releases energy to its surroundings |
| vaporization | phase change in which a substance changes from a liquid to a gas |
| heat of vaporization | energy a substance must absorb in order to change from liquid to gas |
| evaporation | process that changes a substance from liquid to gas at temps below its boiling point |
| vapor pressure | pressure caused by the collisions of particles in a vapor with the walls of a container |
| condensation | phase change in which a substance changes from a gas or vapor to a liquid |
| sublimation | phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first |
| deposition | phase change in which a substance changes from gas to solid |
