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Glossary
Total terms found: 19
Amino acids
Compounds, containing within their structure at least one amino group (NHy) and one carboxylic group (-COOH)). Sub-units of amino acids make up proteins.
Amplitude
The magnitude of the maximum displacement of an oscillating sound wave.
Anaerobic digestion
Digestion of organic matter by anaerobic microbial action, resulting in the production of methane gas.
Anaerobiosis
The presence of life in an anaerobic environment.
Anion
A negatively charged ion.
Anion exchange capacity
The ability to exchange positively charged particles of two or more compounds, measured in milliequivalents per 100 grams.
Anthropogenic
Relating to the science of man.
Aquaclude
Rocks and soils which transmit water with difficulty, e.g. clay, shale and unfractured granite.
Aquifer
Rocks and soils which transmit water with ease through their pores and fractures, e.g. limestone, sandstone and fractured granite.
Aromatic compounds
Compounds which contain a six-membered ring of carbon atoms, known as a benzene ring, e.g. vitamin B.
Atmospheric boundary layer
A region near the earth in which the relative velocity increases from zero with elevation, due to the motion of the atmosphere relative to the earth’s surface.
Atmospheric inversion
A term which describes the rising of warm air above cold air when two air masses of different temperatures, humidity and pressure meet.
Attached growth
Fixed microbial growth on the media surface in a trickling filter.
Attentuate and disperse landfill sites
The traditional type of landfill site from which the leachate produced seeps through soil assures and pores into the underlying saturated zone, where it is diluted.
Attrition
A gradual abrasion.
Auto-ignition temperature
The temperature to which a reactive mixture must be raised so that, under certain conditions of pressure and after a specific period of time, that mixture will spontaneously ignite.
Autotrophic
A term applied to organisms which produce their own organic constituents from inorganic compounds utilizing energy from sunlight or oxidation processes.
Available water content
The water available in the soil for plant use, i.e. the difference between the permanent wilting point and the field capacity.
Avogadro number
The number of atoms of carbon in exactly twelve grams of the carbon-12 isotope, i.e. 6.023x1023.
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