Parts per billion
EPA Glossary of Climate Change Terms
Number of parts of a chemical found in one billion parts of a particular gas, liquid, or solid mixture. See concentration.
(ppb)/Parts Per Million (ppm)
Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air.
Source: Terms of the Environment ...
Parts per billion (ppb): Expressed as ppb; a unit of concentration equivalent to the µg/l.
: A unit frequently used to measure contamination concentration (parts of contamination per billion parts of water). One thousand is equal to one part per million.
parts per billion (ppb)
Number of parts of a chemical found in 1 billion parts of a particular gas, liquid, or solid mixture.
parts per million (ppm) ...
A weight to weight ratio used to describe concentrations. (ppb) is the number of units of mass of a contaminant per 1000 million units of total mass.
Also Âµg/L or micrograms per liter. (Source: GreenFacts) ...
Parts per billion (ppb)
A unit of measure used to describe levels or concentrations of contamination. A measure of concentration, equaling 0.0000001 percent.
P in volume
Definition (english only)
A way to describe how much of a substance is contained in a sample: parts of analyte per billion parts of sample.
Parts per billion.
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ppb . Also µg/L or micrograms per liter.
ppm Parts per million. Also mg/L or milligrams per liter.
Parts per billion.
Parts per million.
The number of existing disease cases in a defined population during a specific time period [contrast with incidence].
PPM: Parts per million.
Pressure, Total: In flowing air, the sum of the static pressure and the velocity pressure.
Abbreviations for "parts per million" and "parts per billion," respectively - the units in which concentrations of greenhouse gases are commonly presented.
Atmospheric concentrations of greenhouse gases are usually expressed in parts per million (ppm) or (ppb). For example, atmospheric CO2 emissions have risen from approximately 280ppm to 385ppm in the last 250 years.
06 parts per billion (ppb), the "safe maximum" recently proposed by California regulators. Yet even Norman, Oklahoma-the city with the highest level of chromium-6 among those studied-had only 12.
A recently released World Health Organization (WHO) document has recommended a drinking water standard of 100 , up from the previous WHO .... soil.
Measure of the sorption phenomenon, whereby a pesticide is divided between the soil and water phase; also referred to as adsorption partition coefficient. Parts Per Billion (ppb)/Parts Per Million (ppm) Units commonly used to express contamination ...
1 milligram per liter (mg/L) =1 part per million (ppm) =1000 (ppb)*
1 microgram per liter (mg/L) =1 nanogram per milliliter (ng/mL) = 1 part per billion (ppb) * ...
A concentration unit of chemical constituents in solution; the weight of solute per unit volume of solvent, usually water, one thousand micrograms per liter is equivalent to 1 milligram per litre, this measure is equivalent to parts per billion.
However, Philadelphia is the exception. Of the 162 homes tested by the city's Water Department, 15% exceeded the federal guidelines which specify that no more than 10% of the homes should exceed a lead level of 15 .
Partition Coefficient: Measure of the sorption phenomenon, whereby a pesticide is divided between the soil and water phase; also referred to as adsorption partition coefficient. Parts Per Billion (ppb)/Parts Per Million (ppm): Units commonly used to ...
of exposure to arsenic include stomach pain, vomiting, diarrhea, partial paralysis, blindness, thickening and discoloration of the skin. The Environmental Protection Agency set a arsenic standard of .010 parts per million (10 ) for ...
Also called pre-consumer material ppb Parts per billion. ppm Parts per million.
See also: Environment, Environmental, Water, Concentration, Air