| A | B |
|---|
| Heat | A form of energy. It causes molecules to be in motion and raises the temperature of a substance. Other forms of energy like electricity, light, and magnetism deteriorate into heat. |
| Heat content | The amount of heat energy contained in a substance. Measured in Btus. |
| Hydrocarbons | Compounds containing only hydrogen and carbon atoms in various combinations. |
| Insulators | Materials that resist heat transfer by conduction. |
| Latent heat | The heat energy absorbed or rejected when a substance is changing state (solid to liquid, liquid to gas, or vice versa) but maintaining its measured temperature. |
| Latent heat of condensation | The heat given up or removed from a gas in changing back to a liquid state (steam to water). |
| Latent heat of fusion | The heat gained or lost in changing to or from a solid (ice to water or water to ice). |
| Latent heat of vaporization | The heat gained in changing from a liquid to a gas (water to steam). |
| Radiation | The movement of heat in the form of invisible rays or waves, similar to light. |
