HVAC Terms and Definitions 274 Questions with 100% Correct Answers | Verified | Updated 2024

Absolute Humidity - ️️The weight of water vapor in a given amount of air space. Absolute humidity is measured by grains per cubic foot. Absolute Pressure - ️️Gauge pressure plus atmospheric pressure. Absolute Temperature - ️️Temperature measured from absolute zero. Absolute Zero Temperature - ️️Temperature at which all molecular motion ceases. (-460F and -273C) Absorbent - ️️Substance with the ability to take up or absorb another substance without causing a chemical or physical damage. Absorption Cycle - ️️Absorption chillers differ from mechanical vapor compression chillers in that they utilize a thermal or chemical process to produce the refrigeration effect necessary to provide chilled water. There is no mechanical compression of the refrigerant taking place within the machine as occurs within more traditional vapor compression type chillers. Most commercial absorption chillers utilize lithium bromide (a salt) and water as the fluid pair. AC - ️️Abbreviation for alternating current, a type of electric current in which the polarity is constantly reversing causing the electron flow to reverse. Absorption Refrigeration - ️️Refrigerator which creates low temperature by using the cooling effect formed when a refrigerant is absorbed by chemical substance. ACCA - ️️Air Conditioning Contractors of America