| A | B |
| condensation | change from gas to liquid |
| pressure | amount of force exerted per unit area |
| temperature | average kinetic energy of particles in a substance |
| thermal energy | total kinetic energy of a substance |
| thermal expansion | increase in size due an increase in temperature |
| vaporization | change from liquid to gas |
| volume | amount of space that a substance fills |
| chemical change | a set of substances changes to form new substances |
| physical change | change in size, state, or shape chemical make-up stays the same |