Laboratory Terms

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

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Vadose Zone: The zone between land surface and the water table within which the moisture c...
Valued Environmental Attributes: Those aspects(components/processes/functions) of ecosystems, human health, an...
Vapor: The gas given off by substances that are solids or liquids at ordinary atmosp...
Vapor Capture System: Any combination of hoods and ventilation system that captures or contains org...
Vapor Dispersion: The movement of vapor clouds in air due to wind, thermal action, gravity spre...
Vapor Plumes: Flue gases visible because they contain water droplets.
Vapor Pressure: A measure of a substance's propensity to evaporate, vapor pressure is the for...
Vapor Recovery System: A system by which the volatile gases from gasoline are captured instead of be...
Variance: Government permission for a delay or exception in the application of a given ...
Vector: 1. An organism, often an insect or rodent, that carries disease. 2. Plasmids,...
Vegetative Controls: Non-point source pollution control practices that involve vegetative cover to...
Vehicle Miles Travelled VMT: A measure of the extent of motor vehicle operation; the total number of vehic...
Velocity Pressure: In flowing air, the pressure due to velocity and density of air.
Ventilation: The act of admitting fresh air into a space in order to replace stale or cont...
Ventilation Rate: The rate at which indoor air enters and leaves a building. Expressed as the n...
Venturi Scrubbers: Air pollution control devices that use water to remove particulate matter fro...
Vinyl Chloride: A chemical compound, used in producing some plastics, that is believed to be ...
Virgin Materials: Resources extracted from nature in their raw form, such as timber or metal ore.
Viscosity: The molecular friction within a fluid that produces flow resistance.
Volatile: Any substance that evaporates readily.
Volatile Liquids: Liquids which easily vaporize or evaporate at room temperature.
Volatile Organic Compound VOC: Any organic compound that participates in atmospheric photochemical reactions...
Volatile Solids: Those solids in water or other liquids that are lost on ignition of the dry s...
Volatile Synthetic Organic Chemicals: Chemicals that tend to volatilize or evaporate.
Volume Reduction: Processing waste materials to decrease the amount of space they occupy, usual...
Volumetric Tank Test: One of several tests to determine the physical integrity of a storage tank; t...
Vulnerability Analysis: Assessment of elements in the community that are susceptible to damage if haz...
Vulnerable Zone: An area over which the airborne concentration of a chemical accidentally rele...

Analytical testing dots

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