The amount of moisture present in the air, measured in kg / kg of dry air.

The pressure of a fluid measured relative to a complete vacuum. It is gauge pressure plus the pressure of the atmosphere.

The zero point on the absolute temperature scale; 0 Kelvin. Minus 273.16 degrees on the Celsius scale.

A substance which is capable of extracting one or more constituents from a mixture of gases and or liquids, and which undergoes a physical or chemical change while performing the extraction.

The area of the low side of an absorption system used for absorbing vapour refrigerant.

The process by which atoms, molecules or ions in a gas or liquid are brought into a solid or liquid. Absorption differs from Adsorption in that the atoms, molecules or ions are taken up by the internal volume of the solid or liquid, rather than remaining on the surface. Absorption often involves a chemical reaction and is not as readily reversible as Adsorption.

The process where exhaust steam and a pump is used in place of the refrigeration compressor.

The tower (contact tower) that uses amine to absorb sour gases in a gas sweetening process.

A type of safety device, located between the evaporator and the compressor, used to reduce the liquid refrigerant carryover flow to the compressor suction.

A colourless, volatile, inflammable liquid (CH3COCH3).

A colourless gas (C2H2) prepared by the action of water with calcium carbide. Acetylene is used in gas welding and cutting.

A covalent substance that, when dissolved in water, produces hydrogen ions (H+) in the solution. A substance capable of donating a proton (+) to another substance. The strength of an acid is determined by its pH value.

A chemical pulping process that uses a chemical calcium sulphide (acid) solution and heat to break the bond between the cellulose and wood fibres.

A sour gas composed of hydrogen sulphide, H2S.

A process used in the making of steel using an acid type slag.