| ppb |
Parts per billion, a measure of concentration, such as parts of a chemical per billion parts of air or water. Ppb is one thousand times smaller than ppm.
출처: www.dhs.ca.gov/ohb/HESIS/utsgloss.htm
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| ppb |
Units typically used in measuring the number of "parts" by weight of a substance in water; commonly used in representing pollutant concentrations.
출처: www.apsu.edu/wet/whatis.html
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| ppb |
Parts Per Billion. Refers to the concentration of a substance in a sample. For example, a concentration of five parts per billion (5 ppb) of benzene means there are five molecules of benzene present in the sample for every 999,999,995 molecules of other substances. The metric equivalents are:
출처: www.deq.state.or.us/wmc/cleanup/glossary.htm
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| ppb |
number of parts of a chemical found in one billion parts of a solid, liquid, or gaseous mixture. Equivalent to micrograms per liter (Ug/L).
출처: www.aquatechnologies.com/info_glossary.htm
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| ppb |
One ppb is comparable to one kernel of corn in a filled, 45-foot silo, 16 feet in diameter. A part per billion is roughly equivalent to one-thousandth teaspoon of water in a 21-foot diameter, 4-foot deep swimming pool.
출처: www.egr.msu.edu/tosc/glossary.shtml
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