Atto-
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Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10−18 or 0.000000000000000001.
The unit multiple was adopted at the 12th General Conference on Weights and Measures (CGPM) in Resolution 8.[1] It is derived from the Danish word atten, meaning "eighteen".
Examples of its use:
- Weight of the HIV-1 virus is about ×10−18 kg or 1×10−15 g, which can be written as 1 1 fg or 1000 ag.
- More examples available.
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- ↑ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.
References
- ↑ International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6, archived (PDF) from the original on 2017-08-14
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