Atto
Encyclopedia
Atto- is a prefix
in the metric system
denoting a factor of 10−18 or .
The unit multiple was adopted at the 11th Conférence Générale des Poids et Mesures (CGPM) in Resolution 12, paragraph 3. It is derived from the Danish
word atten, meaning "eighteen".
SI prefix
The International System of Units specifies a set of unit prefixes known as SI prefixes or metric prefixes. An SI prefix is a name that precedes a basic unit of measure to indicate a decadic multiple or fraction of the unit. Each prefix has a unique symbol that is prepended to the unit symbol...
in the metric system
Metric system
The metric system is an international decimalised system of measurement. France was first to adopt a metric system, in 1799, and a metric system is now the official system of measurement, used in almost every country in the world...
denoting a factor of 10−18 or .
The unit multiple was adopted at the 11th Conférence Générale des Poids et Mesures (CGPM) in Resolution 12, paragraph 3. It is derived from the Danish
Danish language
Danish is a North Germanic language spoken by around six million people, principally in the country of Denmark. It is also spoken by 50,000 Germans of Danish ethnicity in the northern parts of Schleswig-Holstein, Germany, where it holds the status of minority language...
word atten, meaning "eighteen".