absolute filter rating A filter rating which indicates that 99.9% of the particles larger than a specified size will be removed by the filter absolute humidity The total amount of water vapor present in the air, measured n grams per cubic meter. absolute pressure The total pressure in a system, equal to the sum of the gage pressure and atmospheric pressure absolute purity water Water with a specific resistance of 18.3 megohm-cm at absolute zero The lowest temperature possible: 0 on the Kelvin scale or approx imately -273C(459.7F). absorbate A substance used to soak up another substance. absorbed dose The amount of a chemical that enters the body of an exposed absorbent Any substance that exhibits the properties of absorption absorption The process of transferring molecules of gas, liquid, or a dissolved substance to the surface of a solid where it is bound by chemical or physical absorption field a trench or pit filled with gravel or loose rock designed to absorb epic tank effluent. ABw Traveling bridge type gravity sand filter by Infilco Degremont, Inc abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters and between the hadal and bathyal zones where light does not penetrate AC See"activated carbon AC Industrial wastewater treatment unit by Colloid Environmental Technologies ACA American conservation association acaricide A pesticide used to kill spiders, ticks, or mites ACBM Asbestos-containing building material Accelapak Modular water treatment plant by Infilco Degremont, Inc Accelator@ Solids contact clarifier with primary and secondary mixing zones by nfilco Degremont, Inc. Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont Accelo-Biox Modular wastewater treatment plant by Infilco Degremont, Inc Accel-o-FacTM Sewage treatment plant design by Lake Aid Systems acceptable risk The level of risk associated with minimal adverse effects, usually determined by a risk analysis Access Analytical Former name of IDEXX Laboratories, Inc. accessory species Species found in less than half but more than one quarter of the area covered by a plant community accident site The location of an unexpected occurrence, failure or loss, either at a plant or along a transportation route, resulting in a release of hazardous materials climatization The physiological and behavioral adjustments of an organism to changes in its Accofloco lon exchange media by Colloid Environmental Technologies Coabsolute filter rating A filter rating which indicates that 99.9% of the particles larger than a specified size will be removed by the filter. absolute humidity The total amount of water vapor present in the air, measured in grams per cubic meter. absolute pressure The total pressure in a system, equal to the sum of the gage pressure and atmospheric pressure. absolute purity water Water with a specific resistance of 18.3 megohm-cm at 25°C. absolute zero The lowest temperature possible; 0° on the Kelvin scale or approx￾imately –273°C (– 459.7°F). absorbate A substance used to soak up another substance. absorbed dose The amount of a chemical that enters the body of an exposed organism. absorbent Any substance that exhibits the properties of absorption. absorption The process of transferring molecules of gas, liquid, or a dissolved substance to the surface of a solid where it is bound by chemical or physical forces. absorption field A trench or pit filled with gravel or loose rock designed to absorb septic tank effluent. ABW® Traveling bridge type gravity sand filter by Infilco Degremont, Inc. abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters and between the hadal and bathyal zones where light does not penetrate. AC See “activated carbon.” AC® Industrial wastewater treatment unit by Colloid Environmental Technologies Co. ACA American Conservation Association. acaricide A pesticide used to kill spiders, ticks, or mites. ACBM Asbestos-containing building material. Accelapak® Modular water treatment plant by Infilco Degremont, Inc. Accelator® Solids contact clarifier with primary and secondary mixing zones by Infilco Degremont, Inc. Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont, Inc. Accelo-Biox® Modular wastewater treatment plant by Infilco Degremont, Inc. Accel-o-Fac™ Sewage treatment plant design by Lake Aid Systems. acceptable risk The level of risk associated with minimal adverse effects, usually determined by a risk analysis. Access Analytical Former name of IDEXX Laboratories, Inc. accessory species Species found in less than half but more than one quarter of the area covered by a plant community. accident site The location of an unexpected occurrence, failure or loss, either at a plant or along a transportation route, resulting in a release of hazardous materials. acclimatization The physiological and behavioral adjustments of an organism to changes in its environment. Accofloc® Ion exchange media by Colloid Environmental Technologies Co