_____ _____ A valve designed to permit flow in one direction only.

A mechanical device used to compress gases.

- The transfer of heat from molecule to molecule within a substance

The complete course of operation of a refrigerant back to a selected starting point in a system.

The temperature at which the removal of any heat will begin a change of state from a vapor to a liquid.

Mass or weight per unit of volume.

A device in which a liquid refrigerant is vaporized. Some superheating usually takes place.

A device that removes moisture, acid and foreign matter from the refrigerant.

Conduction, convection and radiation.

The temperature at which the addition of any heat will begin a change of state from a solid to a liquid.

Device installed in hot gas line to silence discharge surges

The transfer of heat without an intervening medium. It is absorbed on contact with a solid surface.

A substance which produces a refrigerating effect while expanding or vaporizing.

A condition of stable equilibrium of a vapor and a liquid.

Heat that can be measured or felt.

A condition where a substance changes from a solid to a gas without becoming a liquid.

A semiconductor which has electrical resistance that varies inversely with temperature

The process of controlling the temperature, humidity, cleanliness and distribution of the air.

A term assigned to a velocity of a moving air stream, usually express FPM.