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Apparent viscosity in cP determined by Brookfield viscometer, which measures the torque required to rotate a spindle at constant speed in oil of a given temperature. Basis for ASTM Method D 2983; used for measuring low temperature viscosity of lubricants.

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).

AIR REHEATING

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

CLOUD POINT

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

ABSOLUTE TEMPERATURE SCALE

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

CARBON RESIDUE

Coked material remaining after an oil has been exposed to high temperatures under controlled conditions.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

ANTI-WEAR ADDITIVE

Improves the service life of tribological elements operating in the boundary lubrication regime. Anti-wear compounds (for example, ZDDP and TCP) start decomposing at 90° to 100°C and even at a lower temperature if water (25 to 50 ppm) is present.

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).
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