Definitions for

**"Parts per billion"****Related Terms:**Parts per million, Part per million, Milligrams per liter, Micrograms per liter, Ppb, Ppm , Mg/l, Parts per trillion, Grains per gallon, Ppt, P.p.m, Milligrams per cubic meter, Concentration, Mg/m3, Application rate, Filtration rate, Cubic feet per second, Flow , G/l, Flow rate, Million gallons per day, Gpd, Gallons per minute, Gpm , Flux , Corrosion rate, Infiltration rate, Megalitre, Gpg, Yield, G/t, Gal, Normality, Perm, Scfh, Pump capacity, Grains, Molality, Discharge, Bulk density, Rate of flow, Acfm, Molarity, Specific capacity, Fpm, Gigahertz, Cfm, Trillion, Feet per second

Number of parts of a chemical found in 1 billion parts of a particular gas, liquid, or solid.

Ratio of amounts expressed as parts pesticide per 10 sample. Strictly the quantities should be the same i.e. weight to weight (solids) or volume to volume (liquids or gases) e.g. 1ppb = 1æ g/kg. A common usage is for weight to volume but to avoid confusion it is recommended that the SI units are used rather than ppb; e.g. æ g/L (Mills et al., 1993)

One pound per billion pounds of water.

Represents the concentration of something in water or soil. One ppb represents one microgram of something per liter of water (ug/l), or one microgram of something per kilogram of soil (ug/kg). ( abbrev. ppb)

a measure of the concentration of a solute that is present in solution in very small amounts; found by dividing the mass of solute by the mass of solution and then multiplying by 109; 1 ppb = one gram of solute in one billion grams solution. (see concentration unit, percent concentration)

Units commonly used to express low concentrations of contaminants. For example, 1 ounce of trichloroethylene (TCE) in 1 million ounces of water is 1 ppm. 1 ounce of TCE in 1 billion ounces of water is 1 ppb. If one drop of TCE is mixed in a competition-size swimming pool, the water will contain about 1 ppb of TCE.

Expressed as ppb; a unit of concentration equivalent to the µg/l.

A measuring unit for the concentration of one material in another. When looking at contamination of water and soil, the substances are often measured in parts per billion. One part per billion is equal to one gram of substance in one billion grams of material. Most drinking water standards are measured in ppb concentrations.

A unit of chemical concentration.

Specifies the concentration by volume of a substance dispersed in another substance

the number of parts of a given substance in a billion parts of some other substance. (Example: In the ambient air, 1 ppb lead represents one part of lead per 1 billion parts of air.)

Compare? One ppb is comparable to one kernel of corn in a filled, 45-foot silo, 16 feet in diameter.

Units commonly used to express low contaminant concentrations. For example, one part per billion (ppb) of trichloroethylene (TCE) equals one drop of TCE mixed in a competition-size swimming pool, and one part per million (ppm) equals one ounce of trichloroethylene (TCE) in one million ounces of water.

A measure of concentration of a dissolved substance. Also known as ppb.

A way of expressing the concentration of a substance in air, water, soil or food. A microgram per kilogram is the same as one part per billion. One ppb means that there is one part of a substance for every billion parts of substance and the medium containing it. One ppb is about one drop of dye in 18,000 gallons of water or about 1 second in 32 years. One ppb is 1,000 times less than one ppm.

(PPB) - unit of measurement for concentration of gas or vapor in air - 1 ppb = .0000001%. 1 inch/16,000 miles or 1 pinch salt/10 tons potato chips

A measure of proportion by weight, equivalent to one unit weight of a material per billion (109) unit weights of compound. One part per billion is equivalent to 1 mg/kg.

Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air. These ratios can also be expressed in "parts per million (ppm)."

A very small unit of measurement. One ppb can be compared to one second in thirty-two years. Because some chemicals are very toxic even at low concentrations, ppb has become a standard unit of measurement in the hazardous waste field. Numerically, a part per billion looks like 0.000000001.

An expression for concentration; one one-thousandth of a part per million; the magnitude of this quantity can be related to 8 ounces of a substance dissolved in 4 inches of water ponded on a 1 square mile area; roughly equivalent in scale to 2 seconds in a lifetime.

Some constituents in water are measured in small units. Many of the trace metals such as mercury and organic compounds such as trihalomethanes are monitored by Tucson Water are measured in terms of parts per billion (or micrograms per liter). To help you visualize how very small this unit is, we offer the following illustrations. One part per billion equals: One second of time in 31.7 years The first 16 inches of a trip to the moon

A measurement of concentration on a weight or volume basis. This term is equivalent to microgram per litre, the preferred term. Used to describe extremely small concentrations.

Also equivalent to micrograms per liter (ug/l)- a measurement of weight, usually used in expressing amounts of organic chemicals in water. It is one thousand times less than a ppm.

the number of "parts" by weight of a substance per billion parts of water. Used to measure extremely small concentrations.

A measurement of concentration of one unit of material dispersed in 1 billion units of another.

A common basis of reporting water quality analysis. As an example, one ppb of trichloroethylene (TCE) equals one drop of TCE mixed in a competition-size swimming pool.

( ppb) Number of parts of a substance found in one billion parts of a particular gas, liquid, or solid.

Equivalent to micrograms per liter. One ppb is equivalent to one drop of water in 55,000 gallons.