A term used to describe the generation of heat when a liquid or gas is compressed. If a flammable mixture is compressed rapidly, heat produced by the compression may be sufficient to raise the temperature of the mixture to its ignition point.

Compressing refrigerant gas without removing or adding heat.

Compression of a gas without extraction of heat, resulting in increased temperature. The temperature developed in compression of a gas is an important factor in lubrication, since oil deteriorates more rapidly at elevated temperatures. Oxidation inhibitors help prevent rapid lubricant breakdown under these conditions.