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)
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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Number of parts of a chemical found in 1 billion parts of a particular gas, liquid, or solid.
parts per million (ppm) ...
ppb Parts per billion. Also µg/L or micrograms per liter.
ppm Parts per million. Also mg/L or milligrams per liter.
Parts per million.
The number of existing disease cases in a defined population during a specific time period [contrast with incidence].
PPB: Parts per billion.
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 "," 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 parts per billion (ppb). For example, atmospheric CO2 emissions have risen from approximately 280ppm to 385ppm in the last 250 years.
06 (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 parts per billion, 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. (ppb)/Parts Per Million (ppm) Units commonly used to express contamination ...
1 milligram per liter (mg/L) =1 part per million (ppm) =1000 parts per billion (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 .
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 parts per billion.
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. (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 parts per billion) for ...
Also called pre-consumer material ppb . ppm Parts per million.
See also: Water, Air, Parts Per Million, Environment, Concentration