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# Femto-

Femto- (symbol f) is a unit prefix in the metric system denoting a factor of 10−15 or. [1]

## Danish language

Danish (dansk, dansk sprog) is a North Germanic language spoken by around six million people, principally in Denmark and in the region of Southern Schleswig in northern Germany, where it has minority language status.

## Enrico Fermi

Enrico Fermi (29 September 1901 – 28 November 1954) was an Italian-American physicist and the creator of the world's first nuclear reactor, the Chicago Pile-1.

## Femtometre

The femtometre (American spelling femtometer, symbol fm derived from the Danish and Norwegian word femten, "fifteen"+Ancient Greek: μέτρον, metrοn, "unit of measurement") is an SI unit of length equal to 10−15 metres, which means a quadrillionth of one.

## General Conference on Weights and Measures

The General Conference on Weights and Measures (Conférence générale des poids et mesures – CGPM) is the supreme authority of the International Bureau of Weights and Measures (Bureau international des poids et mesures – BIPM), the inter-governmental organization established in 1875 under the terms of the Metre Convention (Convention du Mètre) through which Member States act together on matters related to measurement science and measurement standards.

## Metric prefix

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.

## Metric system

The metric system is an internationally adopted decimal system of measurement.

## Nuclear physics

Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions.

## Orders of magnitude (mass)

To help compare different orders of magnitude, the following lists describe various mass levels between 10&minus;40&thinsp;kg and 1053 kg.

## Orders of magnitude (numbers)

This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities.

## Proton

| magnetic_moment.

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## Subtypes of HIV

One of the obstacles to treatment of the human immunodeficiency virus is its high genetic variability.

## Virus

A virus is a small infectious agent that replicates only inside the living cells of other organisms.

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## References

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