| A | B |
|---|
| Refrigerant | A liquid or gas that picks up heat by evaporating at a low temperature and pressure, and gives up heat by condensing at a higher temperature and pressure. |
| Refrigeration | The transfer of heat from a space or object where it is not wanted to a space or object where it is not objectionable. |
| Sensible heat | Heat that can be measured by a thermometer or sensed by touch. The energy of molecular motion. |
| Slug | A large amount of liquid refrigerant and/or oil entering a compressor cylinder. |
| Specific heat | The amount of heat required to raise the temperature of one pound of a substance one degree Fahrenheit. Expressed as Btu/lb/°F. |
| Subcooling | Cooling a liquid below its condensing temperature. |
| Superheat | The measurable heat added to the vapor or gas produced after a liquid has reached its boiling point and completely changed into a vapor. |
| Thermistor | A semiconductor device that changes resistance with a change in temperature. |
| Thermocouple | A device made of two different metals that generates electricity when there is a difference in temperature from one end to the other. |
| Ton of refrigeration | Large unit for measuring the rate of heat transfer. One ton is defined as 12,000 Btus per hour or 12,000 Btuh. |
| Total heat | Sensible heat plus latent heat. |
