| One Btu is the amount of heat energy given off by a typical birthday candle. |
| A heat pump in a forced-air EES uses a heat exchanger to take the heat energy from the refrigerant to heat the air that is blown over it. |
| Before wet wood can burn, heat energy must first supply enough energy to vaporize the water. |
| Heat death will occur when all the energy of the cosmos has been degraded to random heat energy, with random motions of molecules and uniform low-level temperatures. |
| Carrying the heat energy away, the warmer refrigerant vapour is sucked back into the compressor and the cycle begins again. |
| This is the amount of heat energy necessary to change the phase or state of matter from liquid to gas. |
