| A | B |
|---|
| central heating system | generates heat from a central location by a network of wires, pipes, ducts, and vents transfers the heat from the heat source to different locations throughout the building |
| insulation | a substance that slows the movement of heat |
| R-value | a measurement of a material's ability to stop heat flow |
| refrigerant | chemicals that evaporate easliy at low temperatures |
| combustion | any type of chemical reaction with oxygen that can give off heat or light |
| turbine | a set of curved blades mounted on a long shaft |
| diesal and gasoline engines | examples of internal-combustion engines |
| steam engine | example of external-combustion engine |
| Watt's steam engine | responsible for starting the Industrial Revolution |
