| A | B |
| kinetic energy | energy of motion |
| thermal energy | The total kinetic (motion) energy of the tiny particles |
| radiation | direct transfer of energy by electromagnetic waves |
| convection | Heat transfer caused by the rising of hotter, less dense fluids and the falling of cooler, denser fluids |
| conduction | Transfer of thermal energy in solids, liquids, and gases when two substances of different temperatures touch |
| conductor | A substance that allows the flow of electrical charge or transfers (moves) thermal energy through matter |
| heat transfer | Thermal energy exchange between two objects of different temperatures; energy moves in a predictable pattern from warmer sites to cooler sites until all sites have reached the same temperature |
| system | A group of interacting, interrelated, or independent parts forming something more complex |