| A | B |
| compression | the decrease of gas volume as a result of applied force |
| contraction | the decrease of volume due to decreased kinetic energy of particles |
| expansion | the increase of volume due to increased kinetic energy of particles |
| kinetic energy | the energy of motion |
| solid | a phase of matter that has a definite volume and definite shape. The particles are tightly bonded and cannot move around. |
| liquid | a phase of matter that has definite volume but no definite shape. Particles are loosely bonded, but can flow over and around one another |
| gas | a phase of matter that has no definite shape or volume. Particles fly independently through space. |
| energy transfer | the movement of energy from one location to another |