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The change from a solid to a liquid and a liquid to a vapour or the reverse.

Related Terms

HYDROMETER

An instrument for determining either the specific gravity of a liquid or the API gravity.

ABSORPTION

The assimilation of one material into another; in petroleum refining, the use of an absorptive liquid to selectively remove components from a process stream.

AERATION

The state of air being suspended in a liquid such as a lubricant or hydraulic fluid.

AGGLOMERATE

The clustering together of a few or many particles into a larger solid mass.

ADHESION

The property of a lubricant that causes it to cling or adhere to a solid surface.

ADSORPTION

Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.

FIRE POINT

The temperature to which a combustible liquid must be heated so that the released vapor will burn continuously when ignited under specified conditions (Clevelend Open Cup).

BARREL

A unit of liquid volume of petroleum oils equal to 42 U.S. gallons or approximately 35 Imperial gallons.

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.

CAPILLARITY

A property of a solid-liquid system manifested by the tendency of the liquid in contact with the solid to rise above or fall below the level of the surrounding liquid; this phenomenon is seen in a small bore (capillary) tube.
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