Natural units, the Glossary
In physics, natural unit systems are measurement systems for which selected physical constants have been set to 1 through nondimensionalization of physical units.[1]
Table of Contents
46 relations: Anthropic units, Astronomical system of units, Bohr model, Boltzmann constant, British Science Association, Coulomb's law, Dimensional analysis, Dimensionless physical constant, Douglas Hartree, Electric charge, Electron mass, Elementary charge, Elementary particle, Erwin Schrödinger, Fine-structure constant, General relativity, George Johnstone Stoney, Gravitational constant, Hydrogen atom, International System of Units, Length, Mass, Mass–energy equivalence, Measurement, N-body units, National Institute of Standards and Technology, Nature (journal), Nondimensionalization, Outline of metrology and measurement, Physical constant, Physics, Planck constant, Proton, Quantum chromodynamics, Quantum gravity, Quantum mechanics, Spacetime, Speed of light, String theory, System of units of measurement, Temperature, Time, Time-variation of fundamental constants, Unit of measurement, Vacuum permittivity, 1.
Anthropic units
The term anthropic unit (from Greek άνθρωπος meaning human) is used with different meanings in archaeology, in measurement and in social studies.
See Natural units and Anthropic units
Astronomical system of units
The astronomical system of units, formerly called the IAU (1976) System of Astronomical Constants, is a system of measurement developed for use in astronomy.
See Natural units and Astronomical system of units
Bohr model
In atomic physics, the Bohr model or Rutherford–Bohr model is an obsolete model of the atom, presented by Niels Bohr and Ernest Rutherford in 1913.
See Natural units and Bohr model
Boltzmann constant
The Boltzmann constant is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic temperature of the gas.
See Natural units and Boltzmann constant
British Science Association
The British Science Association (BSA) is a charity and learned society founded in 1831 to aid in the promotion and development of science.
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Coulomb's law
Coulomb's inverse-square law, or simply Coulomb's law, is an experimental law of physics that calculates the amount of force between two electrically charged particles at rest.
See Natural units and Coulomb's law
Dimensional analysis
In engineering and science, dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities (such as length, mass, time, and electric current) and units of measurement (such as metres and grams) and tracking these dimensions as calculations or comparisons are performed.
See Natural units and Dimensional analysis
Dimensionless physical constant
In physics, a dimensionless physical constant is a physical constant that is dimensionless, i.e. a pure number having no units attached and having a numerical value that is independent of whatever system of units may be used.
See Natural units and Dimensionless physical constant
Douglas Hartree
Douglas Rayner Hartree (27 March 1897 – 12 February 1958) was an English mathematician and physicist most famous for the development of numerical analysis and its application to the Hartree–Fock equations of atomic physics and the construction of a differential analyser using Meccano.
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Electric charge
Electric charge (symbol q, sometimes Q) is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
See Natural units and Electric charge
Electron mass
In particle physics, the electron mass (symbol) is the mass of a stationary electron, also known as the invariant mass of the electron.
See Natural units and Electron mass
Elementary charge
The elementary charge, usually denoted by, is a fundamental physical constant, defined as the electric charge carried by a single proton or, equivalently, the magnitude of the negative electric charge carried by a single electron, which has charge −1.
See Natural units and Elementary charge
Elementary particle
In particle physics, an elementary particle or fundamental particle is a subatomic particle that is not composed of other particles.
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Erwin Schrödinger
Erwin Rudolf Josef Alexander Schrödinger (12 August 1887 – 4 January 1961), sometimes written as or, was a Nobel Prize–winning Austrian and naturalized Irish physicist who developed fundamental results in quantum theory.
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Fine-structure constant
In physics, the fine-structure constant, also known as the Sommerfeld constant, commonly denoted by (the Greek letter ''alpha''), is a fundamental physical constant which quantifies the strength of the electromagnetic interaction between elementary charged particles.
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General relativity
General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics.
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George Johnstone Stoney
George Johnstone Stoney (15 February 1826 – 5 July 1911) was an Irish physicist.
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Gravitational constant
The gravitational constant is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's theory of general relativity.
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Hydrogen atom
A hydrogen atom is an atom of the chemical element hydrogen.
See Natural units and Hydrogen atom
International System of Units
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.
See Natural units and International System of Units
Length
Length is a measure of distance.
Mass
Mass is an intrinsic property of a body.
Mass–energy equivalence
In physics, mass–energy equivalence is the relationship between mass and energy in a system's rest frame, where the two quantities differ only by a multiplicative constant and the units of measurement.
See Natural units and Mass–energy equivalence
Measurement
Measurement is the quantification of attributes of an object or event, which can be used to compare with other objects or events. Natural units and Measurement are metrology.
See Natural units and Measurement
N-body units
M.
See Natural units and N-body units
National Institute of Standards and Technology
The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness.
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Nature (journal)
Nature is a British weekly scientific journal founded and based in London, England.
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Nondimensionalization
Nondimensionalization is the partial or full removal of physical dimensions from an equation involving physical quantities by a suitable substitution of variables.
See Natural units and Nondimensionalization
Outline of metrology and measurement
The following is a topical outline of the English language Wikipedia articles on the topic of metrology and measurement. Natural units and outline of metrology and measurement are metrology.
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Physical constant
A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory and therefore must be measured experimentally.
See Natural units and Physical constant
Physics
Physics is the natural science of matter, involving the study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force.
Planck constant
The Planck constant, or Planck's constant, denoted by is a fundamental physical constant of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.
See Natural units and Planck constant
Proton
A proton is a stable subatomic particle, symbol, H+, or 1H+ with a positive electric charge of +1 e (elementary charge).
Quantum chromodynamics
In theoretical physics, quantum chromodynamics (QCD) is the study of the strong interaction between quarks mediated by gluons.
See Natural units and Quantum chromodynamics
Quantum gravity
Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics.
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Quantum mechanics
Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms.
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Spacetime
In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum.
See Natural units and Spacetime
Speed of light
The speed of light in vacuum, commonly denoted, is a universal physical constant that is exactly equal to). According to the special theory of relativity, is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space.
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String theory
In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.
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System of units of measurement
A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other.
See Natural units and System of units of measurement
Temperature
Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness.
See Natural units and Temperature
Time
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future.
Time-variation of fundamental constants
The term physical constant expresses the notion of a physical quantity subject to experimental measurement which is independent of the time or location of the experiment.
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Unit of measurement
A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.
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Vacuum permittivity
Vacuum permittivity, commonly denoted (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum.
See Natural units and Vacuum permittivity
1
1 (one, unit, unity) is a number representing a single or the only entity.
References
[1] https://en.wikipedia.org/wiki/Natural_units
Also known as Natural unit, Natural unit system.