| ppb |
Units commonly used to express contamination ratios of the amount of a contaminant in water, land, or air. In water, 1 microgram (1 millionth of a gram) of a substance per liter of water is equal to one part per billion, while 1 milligram (1 thousandth of a gram) of a substance per liter of water is equal to one part per million. 1 liter of fresh water weighs approximately 1000 grams.
출처: www.epa.gov/region09/cross_pr/mtbe/charnock/defini...
|
|---|---|
| ppb |
parts per billion.
출처: www.deh.gov.au/soe/2001/coasts/glossary.html
|
| ppb |
Parts per billion; a measure of concentration. May represent the concentration of a residue in soil, water or whole animals. For example, one ppb is equivalent to one second in 32 years.
출처: www.uoguelph.ca/GTI/urbanpst/glossn_z.htm
|
| ppb |
A lot size technique that uses look ahead and look back functions to consider additional periods in modifying an initial calculation based on least total cost.
출처: www.bridgefieldgroup.com/glos7.htm
|
| ppb |
parts per billion, equal to micrograms per litre.
출처: guppyplace.tripod.com/Glossary.html
|