ppb
2
5.9
A unit showing a very small amount, one part in a billion
- symbol
- Specialized
:
ppb
- Scientists measured the pollutant at 0.5 ppb in the atmosphere.
Examples
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The concentration of lead in the water was measured at 15 ppb.
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Regulations limit the amount of arsenic in drinking water to 10 ppb.
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The laboratory detected only 2 ppb of mercury in the fish sample.
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Can you explain what ppb means?
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The laboratory detected only 2 ppb of mercury in the fish sample.
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Regulations limit the amount of arsenic in drinking water to 10 ppb.
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Scientists measured the pollutant at 0.5 ppb in the atmosphere.
How Concentrated
Surface Forms
ppb main
Etymology
Ppb is a short form of parts per billion, where parts means 'pieces', per means 'for each', and billion means 'a very large number'. Like percent ('per hundred') or ppm ('parts per million'), ppb tells you how small the amount of a substance is by counting how many tiny pieces of it are in a billion parts of a sample.