Laboratory Terms U

A glossary of science, chemistry, environmental and laboratory terms.

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19 results match your search term:  U


Ultra Clean Coal UCC
Coal that is washed, ground into fine particles, then chemically treated to r...

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Ultraviolet Rays
Radiation from the sun that can be useful or potentially harmful. UV rays fro...

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Uncertainty Factor
One of several factors used in calculating the reference dose from experiment...

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Unconfined Aquifer
An aquifer containing water that is not under pressure; the water level in a ...

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Underground Injection Control UIC
The program under the Safe Drinking Water Act that regulates the use of wells...

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Underground Injection Wells
Steel- and concrete-encased shafts into which hazardous waste is deposited by...

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Underground Sources of Drinking Water
Aquifers currently being used as a source of drinking water or those capable ...

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Underground Storage Tank UST
A tank located at least partially underground and designed to hold gasoline o...

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Unreasonable Risk
Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), "unrea...

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Unsaturated Zone
The area above the water table where soil pores are not fully saturated, alth...

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Upper Detection Limit
The largest concentration that an instrument can reliably detect.

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Uranium Mill Tailings Piles
Former uranium ore processing sites that contain leftover radioactive materia...

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Uranium Mill-Tailings Waste Piles
Licensed active mills with tailings piles and evaporation ponds created by ac...

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Urban Runoff
Storm water from city streets and adjacent domestic or commercial properties ...

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Urea-Formaldehyde Foam Insulation
A material once used to conserve energy by sealing crawl spaces, attics, etc....

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Use Cluster
A set of competing chemicals, processes, and/or technologies that can substit...

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Used Oil
Spent motor oil from passenger cars and trucks collected at specified locatio...

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User Fee
Fee collected from only those persons who use a particular service, as compar...

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Utility Load
The total electricity demand for a utility district.

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