Ambient Temperature: Temperature of the surroundings, usually atmospheric air

Ampere (Amp): Unit of electrical current measurement

British Thermal Unit: A Unit of thermal energy defined as the amount of heat required to raise the temperature of one pound of water one Fahrenheit degree

Celsius Scale: A temperature scale based upon water freezing at 0ºC and boiling at 100ºC

Change of Phase: The transition from or to solid, liquid and vapor states

Condense: Change phase from vapor to liquid

Conditioned Space: The volume (generally air) being cooled or heated

Conduction: The transfer of heat through a solid as a result of a temperature difference

Convection: The transfer of heat through the motion of a fluid

Delta-T: Short-hand for the "difference in temperature"

Delta-P: Short-hand for the "difference in pressure"

Dew Point: The temperature at which atmospheric water vapor will condense to liquid

Return to A/C 101