| ppb |
Parts per billion are used to determine the concentration of a chemical substance in a given volume. First of all, the volume is divided into a billion of equal parts. Each billionth part, that corresponds to the studied substance, is considered as a part per billion (PPB) of the substance. PPB are used to determine very small gas concentrations in the atmosphere.
출처: www.aacog.com/air/Learning/MtoS.htm
|
|---|---|
| ppb |
Parts per billion or micrograms per liter (
출처: www.cabq.gov/waterquality/resources/definitions.ht...
|
| ppb |
One part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000.
출처: www.astoria.or.us/water/definitions.html
|
| ppb |
Parts per billion is a of measurement of pollutant concentration.
출처: www.ias.unu.edu/ecology/monitoring/terms.htm
|
| ppb |
Parts per billion: a weight unit of measurement.1% is equivalent to 10,000,000 ppb, 1 ppb is equivalent to 0.001 ppm or 0.0000001%.
출처: www.acmelab.com/cfm/index.cfm
|