An opening in the earth from which hot gases, smoke, and molten material issue, or a hill or mountain composed of volcanic material. A volcano is characteristically conical in shape with a crater in the top.
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ABRASION RESISTANCE
The ability of a material to resist surface wear.
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DIELECTRIC STRENGTH
A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)
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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.
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CARBON RESIDUE
Coked material remaining after an oil has been exposed to high temperatures under controlled conditions.
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CONTAMINATION CONTROL
A broad subject which applies to all types of material systems (including both biological and engineering). It is concerned with planning, organizing, managing, and implementing all activities required to determine, achieve and maintain a specified contamination level.
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HELIOCENTRIC PARALLAX
The difference in the apparent direction or positions of a celestial body outside the solar system, as observed from the earth and sun. Also called STELLAR PARALLAX, ANNUAL PARALLAX
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DUNNAGE
Cushioning material placed among cargo to prevent their motion
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BASE
A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.
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ENVIRONMENTAL CONTAMINANT
All material and energy present in and around an operating system, such as dust, air moisture, chemicals, and thermal energy.
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BUILT-IN-DIRT
Material passed into the effluent stream composed of foreign materials incorporated into the filter medium.
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