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19 Heat
Heat
| conductors of heat | materials that allow heat to pass through |
| contraction | decreases in size of object caused by loss of heat |
| expansion | increase in size caused by gain in heat |
| flammable | can catch fire easily |
| good conductors of heat | heat flows through them easily |
| interact | act on each other |
| poor conductor | do not allow heat to flow through easily |