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The ratio of the density of a liquid at a given temperature to the density of fresh water at a standard temperature.

Related Terms

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

ABSOLUTE ZERO TEMPERATURE

Temperature measured from absolute zero (-459.67°F, or -273.16°C).

HYDROMETER

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

AIR REHEATING

In an air conditioning system, the final step in treatment, in the event the temperature is too low.

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.

CLOUD POINT

The temperature at which waxy crystals in an oil or fuel form a cloudy appearance.

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

ABSOLUTE TEMPERATURE SCALE

A scale of temperature measurement in which zero degrees is absolute zero.

AERATION

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