Supriya Ghosh (Editor)

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. It is derived from the Danish word atten, meaning "eighteen".

Examples of its use:

  • Weight of the HIV-1 virus is about 6982100000000000000♠1×10−18 kg or 6982100000000000000♠1×10−15 g, which can be written as 1 fg or 1000 ag.
  • More examples available.

    • References

    Atto- Wikipedia
    (Text) CC BY-SA