Glossary B
A Backflow /Back Siphonage is a reverse flow condition created by a difference in water pressures that causes water to flow back into the distribution pipes of a drinking water supply
- Background: A background (radiation) is Natural radiation caused by sun exposure, cosmic rays from space, and radioactive elements found in the earth's crust.
A Background concentrations: is In this context, EPA uses background concentrations to mean the contributions to outdoor Air Toxics concentrations resulting from natural sources, persistence in the environment of past years' emissions and long-range transport from distant sources.
Background extinction is the normal extinction of various species as a result of changes in local Environmental conditions. Compare mass depletion, mass extinction.
A Background Level is
1. The Concentration of a substance in an Environmental media (air, water, or soil) that occurs naturally or is not the result of human activities.
2. In Read more ...
1. The Concentration of a substance in an Environmental media (air, water, or soil) that occurs naturally or is not the result of human activities.
2. In Read more ...
The Background radiation is the radiation arising from radioactive material other than that under consideration.
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