26 relations: Ancient Greek, Atomic nucleus, Barn (unit), Bohr radius, Enrico Fermi, General Conference on Weights and Measures, Gold, Imperial units, International System of Units, Italy, Length, Metre, Metric system, Nanometre, Natural units, Nuclear physics, Orders of magnitude (length), Particle physics, Physicist, Picometre, Planck length, Proton, Radius, Reviews of Modern Physics, Robert Hofstadter, United States customary units.

## Ancient Greek

The Ancient Greek language includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.

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## Atomic nucleus

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.

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## Barn (unit)

A barn (symbol: b) is a unit of area equal to 10−28 m2 (100 fm2).

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## Bohr radius

The Bohr radius (a0 or rBohr) is a physical constant, approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state.

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## 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.

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## 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.

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## Gold

Gold is a chemical element with symbol Au (from aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally.

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## Imperial units

The system of imperial units or the imperial system (also known as British Imperial or Exchequer Standards of 1825) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.

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## International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

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## Italy

Italy (Italia), officially the Italian Republic (Repubblica Italiana), is a sovereign state in Europe.

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## Length

In geometric measurements, length is the most extended dimension of an object.

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## Metre

The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI).

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## Metric system

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

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## Nanometre

The nanometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (m).

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## Natural units

In physics, natural units are physical units of measurement based only on universal physical constants.

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## Nuclear physics

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

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## Orders of magnitude (length)

The following are examples of orders of magnitude for different lengths.

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## Particle physics

Particle physics (also high energy physics) is the branch of physics that studies the nature of the particles that constitute matter and radiation.

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## Physicist

A physicist is a scientist who has specialized knowledge in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.

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## Picometre

The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the metric system, equal to, or one trillionth of a metre, which is the SI base unit of length.

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## Planck length

In physics, the Planck length, denoted, is a unit of length, equal to metres.

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## Proton

| magnetic_moment.

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## Radius

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length.

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## Reviews of Modern Physics

Reviews of Modern Physics is a quarterly peer-reviewed scientific journal published by the American Physical Society.

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## Robert Hofstadter

Robert Hofstadter (February 5, 1915 – November 17, 1990) was an American physicist.

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## United States customary units

United States customary units are a system of measurements commonly used in the United States.

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## Redirects here:

Femtometer, Femtometres, Fermi (length), Fermi (measurement), Fermi (unit), Fermi unit, Fermimeter, Fermimetre, ㎙.