Associated gas

Natural gas found in association with oil, either dissolved in the oil or as a cap of free gas above the oil.

ASTM

American Society for Testing Materials. A society formed in 1898 to promote the standardisation of specifications and methods of testing in the field of engineering materials.

Atmospheric pressure

The pressure of air in the open atmosphere, exerted equally in all directions. The standard pressure at sea level is that which will support a column of mercury 760 millimetres high (29.92 ins). This is equivalent to about 14.7 pounds to the square inch, or 1.0133 bar.

Atomic number

The number of protons within an atomic nucleus, or the number of orbital electrons in a neutral atom. Also equals the total number of neutrons and protons in the atomic nucleus.

Atomic weight

The relative weight of an atom of an element as compared with the weight of one atom of oxygen, using 16 as the weight of one atom of oxygen.

Atomisation

Conversion of a liquid into a mist, or spray.

Attapulgite

A clay used in salt water drilling muds to improve the mud's carrying capacity; also called salt gel.

Attenuation

A lessening in amount, particularly the reduction of the amplitude of a wave or the intensity of light or sound with distance from the origin.

Automatic gain control

A circuit which automatically maintains a constant output volume regardless of input signal strength. Also called automatic volume control.

AVI

An AVI is a short video sequence captured from the incoming video stream and stored on the hard disk as a windows file. Once captured the AVI will normally need to be converted to a standard format before it can be distributed to other PC's. An AVI Converter application is included with Inspection Manager Eventing Module.

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