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What is Atto?

Atto denotes a unit one-quintillionth (10−18) the size of the unit named by the stem.

Atto (a) is a unit prefix denoting a variable of 10−18 or 0.0000000000000001 in the metric system. The unit multiple was introduced in Resolution 8 at the 12th General Weights and Measures Meeting. It comes from the Danish word atten which means eighteen.

Example:

  • Weight of the HIV-1 virus is about 1×10−18 kg which can be written as 1000 ag.
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