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Compression of materials into a dense, hard substance with the aid of heat.

Related Terms

COMPOUND

(1) chemically speaking, a distinct substance formed by the combination of two or more elements in definite proportions by weight and possessing physical and chemical properties different from those of the combining elements. (2) in petroleum processing, generally connotes fatty oils and similar materials foreign to petroleum added to lubricants to impart special properties.

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.

ACIDIC

The reaction of a substance with water resulting in an increase in concentration of hydrogen ions in solution (see acid).

FLUID

A substance readily assuming the shape of the container in which it is placed; e.g. oil, gas, water or mixtures of these. A general classification including liquids and gases.

CATALYST

A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.

LIQUID

Any substance that flows readily or changes in response to the smallest influence. More generally, any substance in which the force required to produce a deformation depends on the rate of deformation rather than on the magnitude of the deformation.

COMPOUNDED OIL

A petroleum oil to which has been added other chemical substances.

SATURATION

Condition existing when substance contains all of another substance it can hold for that temperature and pressure.

INHIBITOR

A substance that slows or prevents such chemical reactions as corrosion or oxidation.

AQUEOUS

Watery. A substance containing water.
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