Glossary

Bob De Wolfe

Consultant

A

Abnormal pressure.

A formation pore pressure that is higher than that resulting from a water gradient.

Absolute temperature.

Temperature related to absolute zero, the temperature at which all molecular activity ceases. Calculated by adding 460 F to the temperature in Fahrenheit to obtain the absolute temperature in degrees Rankine or by adding 273 C to the temperature in degrees Celsius to obtain the absolute temperature in degrees Kelvin.

Absorb.

To take in and make part of an existing whole. See: absorption, adsorption, adsorb, adsorbed liquid, bound liquid.

Absorption.

The penetration or apparent disappearance of molecules or ions of one or more substances into the interior of a solid or liquid. For example, in hydrated bentonite, the planar water that is held between the mica-like layers is the result of absorption. See: absorb, adsorption, adsorb, adsorbed liquid, bound liquid.

Acid.

Any chemical compound containing hydrogen capable of being replaced by elements or radicals to form salts. In terms of the dissociation theory, it is a compound, which, on dissociation in solution, yields excess hydrogen ions. Acids lower the pH. Examples of acids or acidic substances are hydrochloric acid (HCl), sodium acid pyrophosphate (SAPP), and sulfuric acid (H ₂SO ₄). See: pH, acidity.

Acidity.

The relative acid strength of liquid as measured by pH. A pH value below 7. See: pH, acid.

Across-the-line-start.

A motor startup method that provides full line voltage to the motor windings.

Active system.