This version:
Latest published version: http://www.QUDT.org/doc/2024/12/DOC_VOCAB-CONSTANTS.html
Previous published version: https://qudt.org/doc/2024/11/DOC_VOCAB-CONSTANTS.html
Editor: Ralph Hodgson, TopQuadrant, Inc
Contributors: Irene Polikoff, Jack Hodges, Ralph Hodgson, Simon J D Cox, Steve Ray
Last Modified: 2024-12-09T20:39:17Z
Copyright © 2011 - 2024 QUDT.org , All Rights Reserved.
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The Constants vocabulary defines terms for and contains the values and standard uncertainties of physical constants, initially populated from the NIST website: The NIST Reference on Constants, Units, and Uncertainty, at http://physics.nist.gov/cuu/index.html
The namespace prefix for resources in this ontology is: constant
The vocabulary graph is available as:
Turtle
A list of graphs imported by http://qudt.org/2.1/vocab/constant is shown below.
| Graph URI | Intent |
|---|---|
| http://qudt.org/2.1/schema/facade/qudt | |
| http://qudt.org/2.1/vocab/unit | To provide a vocabulary of all units. |
The graph uses 5 resources from other graphs that are not imported, as listed below:
The main namespace for resources in this graph is http://qudt.org/vocab/constant/ with the prefix constant.
No Classes defined in this graph
No Properties defined in this graph
The graph defines, or extends, 334 instances, as indexed below:
No restricted datatypes defined in this graph
constant:AlphaParticleElectronMassRatio
URI: http://qudt.org/vocab/constant/AlphaParticleElectronMassRatio
constant:AlphaParticleMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/AlphaParticleMassEnergyEquivalent
constant:AlphaParticleMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/AlphaParticleMassEnergyEquivalentInMeV
constant:AlphaParticleMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/AlphaParticleMassInAtomicMassUnit
constant:AlphaParticleMolarMass
URI: http://qudt.org/vocab/constant/AlphaParticleMolarMass
constant:AlphaParticleProtonMassRatio
URI: http://qudt.org/vocab/constant/AlphaParticleProtonMassRatio
constant:AtomicMassConstant
URI: http://qudt.org/vocab/constant/AtomicMassConstant
The $\textit{Atomic Mass Constant}$ is one twelfth of the mass of an unbound atom of carbon-12 at rest and in its ground state.
constant:AtomicMassConstantEnergyEquivalent
URI: http://qudt.org/vocab/constant/AtomicMassConstantEnergyEquivalent
constant:AtomicMassConstantEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/AtomicMassConstantEnergyEquivalentInMeV
constant:AtomicMassUnitElectronVoltRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitElectronVoltRelationship
constant:AtomicMassUnitHartreeRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitHartreeRelationship
constant:AtomicMassUnitHertzRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitHertzRelationship
constant:AtomicMassUnitInverseMeterRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitInverseMeterRelationship
constant:AtomicMassUnitJouleRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitJouleRelationship
constant:AtomicMassUnitKelvinRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitKelvinRelationship
constant:AtomicMassUnitKilogramRelationship
URI: http://qudt.org/vocab/constant/AtomicMassUnitKilogramRelationship
constant:AtomicUnitOf1stHyperpolarizablity
URI: http://qudt.org/vocab/constant/AtomicUnitOf1stHyperpolarizablity
constant:AtomicUnitOf2ndHyperpolarizablity
URI: http://qudt.org/vocab/constant/AtomicUnitOf2ndHyperpolarizablity
constant:AtomicUnitOfChargeDensity
URI: http://qudt.org/vocab/constant/AtomicUnitOfChargeDensity
constant:AtomicUnitOfCurrent
URI: http://qudt.org/vocab/constant/AtomicUnitOfCurrent
constant:AtomicUnitOfElectricDipoleMoment
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricDipoleMoment
constant:AtomicUnitOfElectricField
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricField
constant:AtomicUnitOfElectricFieldGradient
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricFieldGradient
constant:AtomicUnitOfElectricPolarizablity
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricPolarizablity
constant:AtomicUnitOfElectricPotential
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricPotential
constant:AtomicUnitOfElectricQuadrupoleMoment
URI: http://qudt.org/vocab/constant/AtomicUnitOfElectricQuadrupoleMoment
constant:AtomicUnitOfMagneticDipoleMoment
URI: http://qudt.org/vocab/constant/AtomicUnitOfMagneticDipoleMoment
constant:AtomicUnitOfMagneticFluxDensity
URI: http://qudt.org/vocab/constant/AtomicUnitOfMagneticFluxDensity
constant:AtomicUnitOfMagnetizability
URI: http://qudt.org/vocab/constant/AtomicUnitOfMagnetizability
constant:AtomicUnitOfMomentum
URI: http://qudt.org/vocab/constant/AtomicUnitOfMomentum
constant:AtomicUnitOfPermittivity
URI: http://qudt.org/vocab/constant/AtomicUnitOfPermittivity
constant:AtomicUnitOfVelocity
URI: http://qudt.org/vocab/constant/AtomicUnitOfVelocity
constant:AvogadroConstant
URI: http://qudt.org/vocab/constant/AvogadroConstant
The $\textit{Avogadro Constant}$ is defined as the ratio of the number of constituent particles N in a sample to the amount of substance $n$ through the relationship $NA = N/n$. Thus, it is the proportionality factor that relates the molar mass of an entity, that is, the mass per amount of substance, to the mass of said entity.
constant:BohrMagneton
URI: http://qudt.org/vocab/constant/BohrMagneton
The $\textit{Bohr Magneton}$ is a physical constant and the natural unit for expressing an electron magnetic dipole moment.
constant:BohrMagnetonInEVPerT
URI: http://qudt.org/vocab/constant/BohrMagnetonInEVPerT
constant:BohrMagnetonInHzPerT
URI: http://qudt.org/vocab/constant/BohrMagnetonInHzPerT
constant:BohrMagnetonInInverseMetersPerTesla
URI: http://qudt.org/vocab/constant/BohrMagnetonInInverseMetersPerTesla
constant:BohrMagnetonInKPerT
URI: http://qudt.org/vocab/constant/BohrMagnetonInKPerT
constant:BohrRadius
URI: http://qudt.org/vocab/constant/BohrRadius
The $\textit{Bohr Radius}$ is a physical constant, approximately equal to the most probable distance between the proton and electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. The precise definition of the Bohr radius is: $$a_0 = \frac{4\pi \epsilon_0 \hbar^2}{me^2}$$ Where, $a_0$ is the Bohr radius, $\epsilon_0$ is the permittivity of a vacuum, $m_e$ is the mass of an electron, $\hbar$ is the reduced Planck's constant, $e$ is the elementary charge. When rearranged to highlight the role of the Coulomb constant and the elementary charge, the formula can be shown as: $$a_0 \equiv \frac{{\hbar ^2 }}{{m_e ke^2 }}$$ Where, $a_0$ is the Bohr radius, $m_e$ is the mass of an electron, $\hbar$ is the reduced Planck's constant, $k$ is the Coulomb Constant, $e$ is the elementary charge.
constant:BoltzmannConstant
URI: http://qudt.org/vocab/constant/BoltzmannConstant
The $\textit{Boltzmann Constant}$, symbol $k$ or $kB$, is the physical constant relating energy at the individual particle level with temperature, which must necessarily be observed at the collective or bulk level. It is the gas constant $R$ divided by the Avogadro constant $N_A$, having the same dimension as entropy. It is named after the Austrian physicist Ludwig Boltzmann.
constant:BoltzmannConstantInEVPerK
URI: http://qudt.org/vocab/constant/BoltzmannConstantInEVPerK
constant:BoltzmannConstantInHzPerK
URI: http://qudt.org/vocab/constant/BoltzmannConstantInHzPerK
constant:BoltzmannConstantInInverseMetersPerKelvin
URI: http://qudt.org/vocab/constant/BoltzmannConstantInInverseMetersPerKelvin
constant:CharacteristicImpedanceOfVacuum
URI: http://qudt.org/vocab/constant/CharacteristicImpedanceOfVacuum
The constant $\textit{Characteristic Impedance of Vacuum}$, symbol $Z0$ is the impedance of free space. This is a physical constant relating the magnitudes of the electric and magnetic fields of electromagnetic radiation travelling through free space. That is, $Z0 = |E|/|H|$, where $|E|$ is the electric field strength and $|H|$ magnetic field strength. It has an exact value, given approximately as 376.73031 ohms. The impedance of free space equals the product of the vacuum permeability or magnetic constant $μ0$ and the speed of light in vacuum $c0$. Since the numerical values of the magnetic constant and of the speed of light are fixed by the definitions of the ampere and the metre respectively, the exact value of the impedance of free space is likewise fixed by definition and is not subject to experimental error.
constant:ClassicalElectronRadius
URI: http://qudt.org/vocab/constant/ClassicalElectronRadius
constant:ComptonWavelength
URI: http://qudt.org/vocab/constant/ComptonWavelength
The constant $\textit{Compton Wavelength}$ is a quantum mechanical property of a particle. It was introduced by Arthur Compton in his explanation of the scattering of photons by electrons. The process is known as Compton scattering. The Compton Wavelength of a particle is equivalent to the wavelength of a photon whose energy is the same as the rest-mass energy of the particle.
constant:ComptonWavelengthOver2Pi
URI: http://qudt.org/vocab/constant/ComptonWavelengthOver2Pi
constant:ConventionalValueOfJosephsonConstant
URI: http://qudt.org/vocab/constant/ConventionalValueOfJosephsonConstant
constant:ConventionalValueOfVonKlitzingConstant
URI: http://qudt.org/vocab/constant/ConventionalValueOfVonKlitzingConstant
constant:DeuteronElectronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/DeuteronElectronMagneticMomentRatio
constant:DeuteronElectronMassRatio
URI: http://qudt.org/vocab/constant/DeuteronElectronMassRatio
constant:DeuteronMagneticMoment
URI: http://qudt.org/vocab/constant/DeuteronMagneticMoment
constant:DeuteronMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/DeuteronMagneticMomentToBohrMagnetonRatio
constant:DeuteronMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/DeuteronMagneticMomentToNuclearMagnetonRatio
constant:DeuteronMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/DeuteronMassEnergyEquivalent
constant:DeuteronMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/DeuteronMassEnergyEquivalentInMeV
constant:DeuteronMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/DeuteronMassInAtomicMassUnit
constant:DeuteronNeutronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/DeuteronNeutronMagneticMomentRatio
constant:DeuteronProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/DeuteronProtonMagneticMomentRatio
constant:DeuteronProtonMassRatio
URI: http://qudt.org/vocab/constant/DeuteronProtonMassRatio
constant:DeuteronRmsChargeRadius
URI: http://qudt.org/vocab/constant/DeuteronRmsChargeRadius
constant:ElectromagneticPermeabilityOfVacuum
URI: http://qudt.org/vocab/constant/ElectromagneticPermeabilityOfVacuum
The $\textit{Permeability of Vacuum}$, also known as $\textit{Magnetic Constant}$, is a scalar constant $\mu_0$ such that, in a vacuum the product with the magnetic field vector, $\overrightarrow{H}$ is equal to the magnetic flux density vector, $\overrightarrow{B}$.
constant:ElectronChargeToMassQuotient
URI: http://qudt.org/vocab/constant/ElectronChargeToMassQuotient
constant:ElectronDeuteronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronDeuteronMagneticMomentRatio
constant:ElectronDeuteronMassRatio
URI: http://qudt.org/vocab/constant/ElectronDeuteronMassRatio
constant:ElectronGyromagneticRatio
URI: http://qudt.org/vocab/constant/ElectronGyromagneticRatio
The $\textit{Electron Gyromagnetic Ratio}$ is a property that an isolated electron has for its angular momentum and magnetic moment resulting from its spin. While an electron's spin is sometimes visualized as a literal rotation about an axis, it is in fact a fundamentally different, quantum-mechanical phenomenon with no true analogue in classical physics. As a consequence there is no reason to expect the above classical relation to hold.
constant:ElectronGyromagneticRatioOver2Pi
URI: http://qudt.org/vocab/constant/ElectronGyromagneticRatioOver2Pi
constant:ElectronMagneticMoment
URI: http://qudt.org/vocab/constant/ElectronMagneticMoment
constant:ElectronMagneticMomentAnomaly
URI: http://qudt.org/vocab/constant/ElectronMagneticMomentAnomaly
constant:ElectronMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/ElectronMagneticMomentToBohrMagnetonRatio
constant:ElectronMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/ElectronMagneticMomentToNuclearMagnetonRatio
constant:ElectronMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/ElectronMassEnergyEquivalent
constant:ElectronMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/ElectronMassEnergyEquivalentInMeV
constant:ElectronMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/ElectronMassInAtomicMassUnit
constant:ElectronMuonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronMuonMagneticMomentRatio
constant:ElectronMuonMassRatio
URI: http://qudt.org/vocab/constant/ElectronMuonMassRatio
constant:ElectronNeutronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronNeutronMagneticMomentRatio
constant:ElectronNeutronMassRatio
URI: http://qudt.org/vocab/constant/ElectronNeutronMassRatio
constant:ElectronProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronProtonMagneticMomentRatio
constant:ElectronProtonMassRatio
URI: http://qudt.org/vocab/constant/ElectronProtonMassRatio
constant:ElectronTauMassRatio
URI: http://qudt.org/vocab/constant/ElectronTauMassRatio
constant:ElectronToAlphaParticleMassRatio
URI: http://qudt.org/vocab/constant/ElectronToAlphaParticleMassRatio
constant:ElectronToShieldedHelionMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronToShieldedHelionMagneticMomentRatio
constant:ElectronToShieldedProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ElectronToShieldedProtonMagneticMomentRatio
constant:ElectronVoltAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltAtomicMassUnitRelationship
constant:ElectronVoltHartreeRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltHartreeRelationship
constant:ElectronVoltHertzRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltHertzRelationship
constant:ElectronVoltInverseMeterRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltInverseMeterRelationship
constant:ElectronVoltJouleRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltJouleRelationship
constant:ElectronVoltKelvinRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltKelvinRelationship
constant:ElectronVoltKilogramRelationship
URI: http://qudt.org/vocab/constant/ElectronVoltKilogramRelationship
constant:ElementaryChargeOverH
URI: http://qudt.org/vocab/constant/ElementaryChargeOverH
constant:FaradayConstant
URI: http://qudt.org/vocab/constant/FaradayConstant
The $\textit{Faraday Constant}$ is a constant equal to the product of electrical elementary charge and Avogadro constant; this is approximately $9.64853321233100184 \times 10^{4}\ C/mol$.
constant:FermiCouplingConstant
URI: http://qudt.org/vocab/constant/FermiCouplingConstant
constant:FineStructureConstant
URI: http://qudt.org/vocab/constant/FineStructureConstant
The $\textit{Fine-structure Constant}$ is a fundamental physical constant, namely the coupling constant characterizing the strength of the electromagnetic interaction.
constant:FirstRadiationConstant
URI: http://qudt.org/vocab/constant/FirstRadiationConstant
The constant $\textit{First Radiation Constant}$ is defined in Planck's radiation law about the dependence of the spectral density of various radiation variables on the wavelength of the electromagnetic radiation and the absolute temperature of the black emitter. This is composed of the product of twice $Pi$ times Planck's quantum of action multiplied by the square of the velocity of light.
constant:FirstRadiationConstantForSpectralRadiance
URI: http://qudt.org/vocab/constant/FirstRadiationConstantForSpectralRadiance
constant:GravitationalConstant
URI: http://qudt.org/vocab/constant/GravitationalConstant
The $\textit{Gravitational Constant}$ (also known as the universal gravitational constant, is the Newtonian constant of gravitation, or the Cavendish gravitational constant). Denoted by the letter $G$, it 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 general theory of relativity.
constant:HartreeAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/HartreeAtomicMassUnitRelationship
constant:HartreeElectronVoltRelationship
URI: http://qudt.org/vocab/constant/HartreeElectronVoltRelationship
constant:HartreeEnergy
URI: http://qudt.org/vocab/constant/HartreeEnergy
The constant $\textit{Hartree Energy}$ (symbol: $E_h$ or $Ha$), also known as the $\textit{Hartree}$, is the atomic unit of energy. The hartree energy is equal to the absolute value of the electric potential energy of the hydrogen atom in its ground state. The energy of the electron in an H-atom in its ground state is $-E_H$, where $E_H= 2 R_\infty \cdot hc_0$. The 2006 CODATA recommended value was $E_H = 4.35974394(22)\ \times 10^{-18}\ J = 27.21138386(68)\ eV$.
constant:HartreeHertzRelationship
URI: http://qudt.org/vocab/constant/HartreeHertzRelationship
constant:HartreeInverseMeterRelationship
URI: http://qudt.org/vocab/constant/HartreeInverseMeterRelationship
constant:HartreeJouleRelationship
URI: http://qudt.org/vocab/constant/HartreeJouleRelationship
constant:HartreeKelvinRelationship
URI: http://qudt.org/vocab/constant/HartreeKelvinRelationship
constant:HartreeKilogramRelationship
URI: http://qudt.org/vocab/constant/HartreeKilogramRelationship
constant:HelionElectronMassRatio
URI: http://qudt.org/vocab/constant/HelionElectronMassRatio
constant:HelionMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/HelionMassEnergyEquivalent
constant:HelionMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/HelionMassEnergyEquivalentInMeV
constant:HelionMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/HelionMassInAtomicMassUnit
constant:HelionProtonMassRatio
URI: http://qudt.org/vocab/constant/HelionProtonMassRatio
constant:HertzAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/HertzAtomicMassUnitRelationship
constant:HertzElectronVoltRelationship
URI: http://qudt.org/vocab/constant/HertzElectronVoltRelationship
constant:HertzHartreeRelationship
URI: http://qudt.org/vocab/constant/HertzHartreeRelationship
constant:HertzInverseMeterRelationship
URI: http://qudt.org/vocab/constant/HertzInverseMeterRelationship
constant:HertzJouleRelationship
URI: http://qudt.org/vocab/constant/HertzJouleRelationship
constant:HertzKelvinRelationship
URI: http://qudt.org/vocab/constant/HertzKelvinRelationship
constant:HertzKilogramRelationship
URI: http://qudt.org/vocab/constant/HertzKilogramRelationship
constant:InverseFineStructureConstant
URI: http://qudt.org/vocab/constant/InverseFineStructureConstant
constant:InverseMeterAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/InverseMeterAtomicMassUnitRelationship
constant:InverseMeterElectronVoltRelationship
URI: http://qudt.org/vocab/constant/InverseMeterElectronVoltRelationship
constant:InverseMeterHartreeRelationship
URI: http://qudt.org/vocab/constant/InverseMeterHartreeRelationship
constant:InverseMeterHertzRelationship
URI: http://qudt.org/vocab/constant/InverseMeterHertzRelationship
constant:InverseMeterJouleRelationship
URI: http://qudt.org/vocab/constant/InverseMeterJouleRelationship
constant:InverseMeterKelvinRelationship
URI: http://qudt.org/vocab/constant/InverseMeterKelvinRelationship
constant:InverseMeterKilogramRelationship
URI: http://qudt.org/vocab/constant/InverseMeterKilogramRelationship
constant:InverseOfConductanceQuantum
URI: http://qudt.org/vocab/constant/InverseOfConductanceQuantum
constant:JosephsonConstant
URI: http://qudt.org/vocab/constant/JosephsonConstant
The constant $\textit{Josephson Constant}$ is a proportionality factor between voltage and frequency of an alternating current corresponding to the product of two elementary charges $e$ and Planck's action quantum $h$.
constant:JouleAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/JouleAtomicMassUnitRelationship
constant:JouleElectronVoltRelationship
URI: http://qudt.org/vocab/constant/JouleElectronVoltRelationship
constant:JouleHartreeRelationship
URI: http://qudt.org/vocab/constant/JouleHartreeRelationship
constant:JouleHertzRelationship
URI: http://qudt.org/vocab/constant/JouleHertzRelationship
constant:JouleInverseMeterRelationship
URI: http://qudt.org/vocab/constant/JouleInverseMeterRelationship
constant:JouleKelvinRelationship
URI: http://qudt.org/vocab/constant/JouleKelvinRelationship
constant:JouleKilogramRelationship
URI: http://qudt.org/vocab/constant/JouleKilogramRelationship
constant:KelvinAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/KelvinAtomicMassUnitRelationship
constant:KelvinElectronVoltRelationship
URI: http://qudt.org/vocab/constant/KelvinElectronVoltRelationship
constant:KelvinHartreeRelationship
URI: http://qudt.org/vocab/constant/KelvinHartreeRelationship
constant:KelvinHertzRelationship
URI: http://qudt.org/vocab/constant/KelvinHertzRelationship
constant:KelvinInverseMeterRelationship
URI: http://qudt.org/vocab/constant/KelvinInverseMeterRelationship
constant:KelvinJouleRelationship
URI: http://qudt.org/vocab/constant/KelvinJouleRelationship
constant:KelvinKilogramRelationship
URI: http://qudt.org/vocab/constant/KelvinKilogramRelationship
constant:KilogramAtomicMassUnitRelationship
URI: http://qudt.org/vocab/constant/KilogramAtomicMassUnitRelationship
constant:KilogramElectronVoltRelationship
URI: http://qudt.org/vocab/constant/KilogramElectronVoltRelationship
constant:KilogramHartreeRelationship
URI: http://qudt.org/vocab/constant/KilogramHartreeRelationship
constant:KilogramHertzRelationship
URI: http://qudt.org/vocab/constant/KilogramHertzRelationship
constant:KilogramInverseMeterRelationship
URI: http://qudt.org/vocab/constant/KilogramInverseMeterRelationship
constant:KilogramJouleRelationship
URI: http://qudt.org/vocab/constant/KilogramJouleRelationship
constant:KilogramKelvinRelationship
URI: http://qudt.org/vocab/constant/KilogramKelvinRelationship
constant:LatticeParameterOfSilicon
URI: http://qudt.org/vocab/constant/LatticeParameterOfSilicon
constant:LatticeSpacingOfSilicon
URI: http://qudt.org/vocab/constant/LatticeSpacingOfSilicon
constant:LoschmidtConstant273.15K101.325KPa
URI: http://qudt.org/vocab/constant/LoschmidtConstant273.15K101.325KPa
constant:LoschmidtConstant273dot15K101dot325KPa
URI: http://qudt.org/vocab/constant/LoschmidtConstant273dot15K101dot325KPa
constant:MagneticConstant
URI: http://qudt.org/vocab/constant/MagneticConstant
The constant $\textit{Magentic Constant}$, also known as $\textit{Permeability of Vacuum}$, is a scalar constant $\mu_0$ such that, in a vacuum the product with the magnetic field vector, $\overrightarrow{H}$ is equal to the magnetic flux density vector, $\overrightarrow{B}$.
constant:MagneticFluxQuantum
URI: http://qudt.org/vocab/constant/MagneticFluxQuantum
The constant $\textit{Magnetic Flux Quantum}$ is the quantum of magnetic flux passing through a superconductor.
constant:MolarGasConstant
URI: http://qudt.org/vocab/constant/MolarGasConstant
The constant $\textit{Molar Gas Constant}$, also known as the gas constant, universal, or ideal gas constant, denoted by the symbol $R$, is a physical constant which is featured in many fundamental equations in the physical sciences, such as the ideal gas law and the Nernst equation. It is equivalent to the Boltzmann constant, but expressed in units of energy (i.e. the pressure-volume product) per temperature increment per mole (rather than energy per temperature increment per particle).
constant:MolarMassOfCarbon12
URI: http://qudt.org/vocab/constant/MolarMassOfCarbon12
constant:MolarPlanckConstant
URI: http://qudt.org/vocab/constant/MolarPlanckConstant
constant:MolarPlanckConstantTimesC
URI: http://qudt.org/vocab/constant/MolarPlanckConstantTimesC
constant:MolarVolumeOfIdealGas273.15K100KPa
URI: http://qudt.org/vocab/constant/MolarVolumeOfIdealGas273.15K100KPa
constant:MolarVolumeOfIdealGas273.15K101.325KPa
URI: http://qudt.org/vocab/constant/MolarVolumeOfIdealGas273.15K101.325KPa
constant:MolarVolumeOfIdealGas273dot15K100KPa
URI: http://qudt.org/vocab/constant/MolarVolumeOfIdealGas273dot15K100KPa
constant:MolarVolumeOfIdealGas273dot15K101dot325KPa
URI: http://qudt.org/vocab/constant/MolarVolumeOfIdealGas273dot15K101dot325KPa
constant:MolarVolumeOfSilicon
URI: http://qudt.org/vocab/constant/MolarVolumeOfSilicon
constant:MuonComptonWavelength
URI: http://qudt.org/vocab/constant/MuonComptonWavelength
constant:MuonComptonWavelengthOver2Pi
URI: http://qudt.org/vocab/constant/MuonComptonWavelengthOver2Pi
constant:MuonElectronMassRatio
URI: http://qudt.org/vocab/constant/MuonElectronMassRatio
constant:MuonMagneticMomentAnomaly
URI: http://qudt.org/vocab/constant/MuonMagneticMomentAnomaly
constant:MuonMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/MuonMagneticMomentToBohrMagnetonRatio
constant:MuonMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/MuonMagneticMomentToNuclearMagnetonRatio
constant:MuonMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/MuonMassEnergyEquivalent
constant:MuonMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/MuonMassEnergyEquivalentInMeV
constant:MuonMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/MuonMassInAtomicMassUnit
constant:MuonNeutronMassRatio
URI: http://qudt.org/vocab/constant/MuonNeutronMassRatio
constant:MuonProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/MuonProtonMagneticMomentRatio
constant:MuonProtonMassRatio
URI: http://qudt.org/vocab/constant/MuonProtonMassRatio
constant:NaturalUnitOfAction
URI: http://qudt.org/vocab/constant/NaturalUnitOfAction
constant:NaturalUnitOfActionInEVS
URI: http://qudt.org/vocab/constant/NaturalUnitOfActionInEVS
constant:NaturalUnitOfEnergy
URI: http://qudt.org/vocab/constant/NaturalUnitOfEnergy
constant:NaturalUnitOfEnergyInMeV
URI: http://qudt.org/vocab/constant/NaturalUnitOfEnergyInMeV
constant:NaturalUnitOfLength
URI: http://qudt.org/vocab/constant/NaturalUnitOfLength
constant:NaturalUnitOfMomentum
URI: http://qudt.org/vocab/constant/NaturalUnitOfMomentum
constant:NaturalUnitOfMomentumInMeV-PER-c
URI: http://qudt.org/vocab/constant/NaturalUnitOfMomentumInMeV-PER-c
constant:NaturalUnitOfVelocity
URI: http://qudt.org/vocab/constant/NaturalUnitOfVelocity
constant:NeutronComptonWavelength
URI: http://qudt.org/vocab/constant/NeutronComptonWavelength
constant:NeutronComptonWavelengthOver2Pi
URI: http://qudt.org/vocab/constant/NeutronComptonWavelengthOver2Pi
constant:NeutronElectronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/NeutronElectronMagneticMomentRatio
constant:NeutronElectronMassRatio
URI: http://qudt.org/vocab/constant/NeutronElectronMassRatio
constant:NeutronGyromagneticRatio
URI: http://qudt.org/vocab/constant/NeutronGyromagneticRatio
constant:NeutronGyromagneticRatioOver2Pi
URI: http://qudt.org/vocab/constant/NeutronGyromagneticRatioOver2Pi
constant:NeutronMagneticMoment
URI: http://qudt.org/vocab/constant/NeutronMagneticMoment
constant:NeutronMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/NeutronMagneticMomentToBohrMagnetonRatio
constant:NeutronMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/NeutronMagneticMomentToNuclearMagnetonRatio
constant:NeutronMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/NeutronMassEnergyEquivalent
constant:NeutronMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/NeutronMassEnergyEquivalentInMeV
constant:NeutronMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/NeutronMassInAtomicMassUnit
constant:NeutronMuonMassRatio
URI: http://qudt.org/vocab/constant/NeutronMuonMassRatio
constant:NeutronProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/NeutronProtonMagneticMomentRatio
constant:NeutronProtonMassRatio
URI: http://qudt.org/vocab/constant/NeutronProtonMassRatio
constant:NeutronTauMassRatio
URI: http://qudt.org/vocab/constant/NeutronTauMassRatio
constant:NeutronToShieldedProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/NeutronToShieldedProtonMagneticMomentRatio
constant:NewtonianConstantOfGravitation
URI: http://qudt.org/vocab/constant/NewtonianConstantOfGravitation
constant:NuclearMagneton
URI: http://qudt.org/vocab/constant/NuclearMagneton
The constant $\textit{Nuclear Magneton}$ is the natural unit for expressing magnetic dipole moments of heavy particles such as nucleons and atomic nuclei.
constant:NuclearMagnetonInEVPerT
URI: http://qudt.org/vocab/constant/NuclearMagnetonInEVPerT
constant:NuclearMagnetonInInverseMetersPerTesla
URI: http://qudt.org/vocab/constant/NuclearMagnetonInInverseMetersPerTesla
constant:NuclearMagnetonInKPerT
URI: http://qudt.org/vocab/constant/NuclearMagnetonInKPerT
constant:NuclearMagnetonInMHzPerT
URI: http://qudt.org/vocab/constant/NuclearMagnetonInMHzPerT
constant:PermittivityOfVacuum
URI: http://qudt.org/vocab/constant/PermittivityOfVacuum
The constant $\textit{Permittivity of Vacuum}$, also known as the $\textit{electric constant}$ is a constant whose value is $\approx\,6.854188e-12\, farad\,per\,metre$. Sometimes also referred to as the $\textit{Permittivity of Free Space}$.
constant:Pi
URI: http://qudt.org/vocab/constant/Pi
The constant $\pi$ is the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159.
constant:PlanckConstant
URI: http://qudt.org/vocab/constant/PlanckConstant
The constant $\textit{Planck Constant}$ is a physical constant that is the quantum of action in quantum mechanics. The Planck constant was first described as the proportionality constant between the energy ($E$) of a photon and the frequency ($\nu$) of its associated electromagnetic wave.
constant:PlanckConstantInEVS
URI: http://qudt.org/vocab/constant/PlanckConstantInEVS
constant:PlanckConstantOver2Pi
URI: http://qudt.org/vocab/constant/PlanckConstantOver2Pi
constant:PlanckConstantOver2PiInEVS
URI: http://qudt.org/vocab/constant/PlanckConstantOver2PiInEVS
constant:PlanckConstantOver2PiTimesCInMeVFm
URI: http://qudt.org/vocab/constant/PlanckConstantOver2PiTimesCInMeVFm
constant:PlanckMassEnergyEquivalentInGeV
URI: http://qudt.org/vocab/constant/PlanckMassEnergyEquivalentInGeV
constant:ProtonChargeToMassQuotient
URI: http://qudt.org/vocab/constant/ProtonChargeToMassQuotient
constant:ProtonComptonWavelength
URI: http://qudt.org/vocab/constant/ProtonComptonWavelength
constant:ProtonComptonWavelengthOver2Pi
URI: http://qudt.org/vocab/constant/ProtonComptonWavelengthOver2Pi
constant:ProtonElectronMassRatio
URI: http://qudt.org/vocab/constant/ProtonElectronMassRatio
constant:ProtonGyromagneticRatio
URI: http://qudt.org/vocab/constant/ProtonGyromagneticRatio
constant:ProtonGyromagneticRatioOver2Pi
URI: http://qudt.org/vocab/constant/ProtonGyromagneticRatioOver2Pi
constant:ProtonMagneticMoment
URI: http://qudt.org/vocab/constant/ProtonMagneticMoment
constant:ProtonMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/ProtonMagneticMomentToBohrMagnetonRatio
constant:ProtonMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/ProtonMagneticMomentToNuclearMagnetonRatio
constant:ProtonMagneticShieldingCorrection
URI: http://qudt.org/vocab/constant/ProtonMagneticShieldingCorrection
constant:ProtonMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/ProtonMassEnergyEquivalent
constant:ProtonMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/ProtonMassEnergyEquivalentInMeV
constant:ProtonMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/ProtonMassInAtomicMassUnit
constant:ProtonMuonMassRatio
URI: http://qudt.org/vocab/constant/ProtonMuonMassRatio
constant:ProtonNeutronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ProtonNeutronMagneticMomentRatio
constant:ProtonNeutronMassRatio
URI: http://qudt.org/vocab/constant/ProtonNeutronMassRatio
constant:ProtonRmsChargeRadius
URI: http://qudt.org/vocab/constant/ProtonRmsChargeRadius
constant:QuantumOfCirculation
URI: http://qudt.org/vocab/constant/QuantumOfCirculation
constant:QuantumOfCirculationTimes2
URI: http://qudt.org/vocab/constant/QuantumOfCirculationTimes2
constant:ReducedPlanckConstant
URI: http://qudt.org/vocab/constant/ReducedPlanckConstant
The $\textit{Reduced Planck Constant}$, or $\textit{Dirac Constant}$, is used in applications where frequency is expressed in terms of radians per second ($\textit{angular frequency}$) instead of cycles per second. In such cases a factor of $\pi$ is absorbed into the constant.
constant:RydbergConstant
URI: http://qudt.org/vocab/constant/RydbergConstant
The $\textit{Rydberg constant}$, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to atomic spectra, in the science of spectroscopy.
constant:RydbergConstantTimesCInHz
URI: http://qudt.org/vocab/constant/RydbergConstantTimesCInHz
constant:RydbergConstantTimesHcInEV
URI: http://qudt.org/vocab/constant/RydbergConstantTimesHcInEV
constant:RydbergConstantTimesHcInJ
URI: http://qudt.org/vocab/constant/RydbergConstantTimesHcInJ
constant:SackurTetrodeConstant1K100KPa
URI: http://qudt.org/vocab/constant/SackurTetrodeConstant1K100KPa
constant:SackurTetrodeConstant1K101.325KPa
URI: http://qudt.org/vocab/constant/SackurTetrodeConstant1K101.325KPa
constant:SackurTetrodeConstant1K101dot325KPa
URI: http://qudt.org/vocab/constant/SackurTetrodeConstant1K101dot325KPa
constant:SecondRadiationConstant
URI: http://qudt.org/vocab/constant/SecondRadiationConstant
constant:ShieldedHelionGyromagneticRatio
URI: http://qudt.org/vocab/constant/ShieldedHelionGyromagneticRatio
constant:ShieldedHelionGyromagneticRatioOver2Pi
URI: http://qudt.org/vocab/constant/ShieldedHelionGyromagneticRatioOver2Pi
constant:ShieldedHelionMagneticMoment
URI: http://qudt.org/vocab/constant/ShieldedHelionMagneticMoment
constant:ShieldedHelionMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/ShieldedHelionMagneticMomentToBohrMagnetonRatio
constant:ShieldedHelionMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/ShieldedHelionMagneticMomentToNuclearMagnetonRatio
constant:ShieldedHelionToProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ShieldedHelionToProtonMagneticMomentRatio
constant:ShieldedHelionToShieldedProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/ShieldedHelionToShieldedProtonMagneticMomentRatio
constant:ShieldedProtonGyromagneticRatio
URI: http://qudt.org/vocab/constant/ShieldedProtonGyromagneticRatio
constant:ShieldedProtonGyromagneticRatioOver2Pi
URI: http://qudt.org/vocab/constant/ShieldedProtonGyromagneticRatioOver2Pi
constant:ShieldedProtonMagneticMoment
URI: http://qudt.org/vocab/constant/ShieldedProtonMagneticMoment
constant:ShieldedProtonMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/ShieldedProtonMagneticMomentToBohrMagnetonRatio
constant:ShieldedProtonMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/ShieldedProtonMagneticMomentToNuclearMagnetonRatio
constant:SpeedOfLight_Vacuum
URI: http://qudt.org/vocab/constant/SpeedOfLight_Vacuum
The $\textit{Speed of Light in Vacuum}$, is a universal physical constant important in many areas of physics. Its value is 299,792,458 metres per second, a figure that is exact because the length of the metre is defined from this constant and the international standard for time.
constant:StandardAccelerationOfGravity
URI: http://qudt.org/vocab/constant/StandardAccelerationOfGravity
constant:StefanBoltzmannConstant
URI: http://qudt.org/vocab/constant/StefanBoltzmannConstant
The $\textit{Stefan Boltzmann Constant}$ is a proportionality factor between the specific radiant heat of a black body and the 4th power of its absolute temperature.
constant:TauComptonWavelength
URI: http://qudt.org/vocab/constant/TauComptonWavelength
constant:TauComptonWavelengthOver2Pi
URI: http://qudt.org/vocab/constant/TauComptonWavelengthOver2Pi
constant:TauElectronMassRatio
URI: http://qudt.org/vocab/constant/TauElectronMassRatio
constant:TauMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/TauMassEnergyEquivalent
constant:TauMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/TauMassEnergyEquivalentInMeV
constant:TauMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/TauMassInAtomicMassUnit
constant:TauNeutronMassRatio
URI: http://qudt.org/vocab/constant/TauNeutronMassRatio
constant:ThomsonCrossSection
URI: http://qudt.org/vocab/constant/ThomsonCrossSection
constant:TritonElectronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/TritonElectronMagneticMomentRatio
constant:TritonElectronMassRatio
URI: http://qudt.org/vocab/constant/TritonElectronMassRatio
constant:TritonMagneticMoment
URI: http://qudt.org/vocab/constant/TritonMagneticMoment
constant:TritonMagneticMomentToBohrMagnetonRatio
URI: http://qudt.org/vocab/constant/TritonMagneticMomentToBohrMagnetonRatio
constant:TritonMagneticMomentToNuclearMagnetonRatio
URI: http://qudt.org/vocab/constant/TritonMagneticMomentToNuclearMagnetonRatio
constant:TritonMassEnergyEquivalent
URI: http://qudt.org/vocab/constant/TritonMassEnergyEquivalent
constant:TritonMassEnergyEquivalentInMeV
URI: http://qudt.org/vocab/constant/TritonMassEnergyEquivalentInMeV
constant:TritonMassInAtomicMassUnit
URI: http://qudt.org/vocab/constant/TritonMassInAtomicMassUnit
constant:TritonNeutronMagneticMomentRatio
URI: http://qudt.org/vocab/constant/TritonNeutronMagneticMomentRatio
constant:TritonProtonMagneticMomentRatio
URI: http://qudt.org/vocab/constant/TritonProtonMagneticMomentRatio
constant:TritonProtonMassRatio
URI: http://qudt.org/vocab/constant/TritonProtonMassRatio
constant:UnifiedAtomicMassUnit
URI: http://qudt.org/vocab/constant/UnifiedAtomicMassUnit
constant:UniversalGasConstant
URI: http://qudt.org/vocab/constant/UniversalGasConstant
constant:VonKlitzingConstant
URI: http://qudt.org/vocab/constant/VonKlitzingConstant
constant:WienFrequencyDisplacementLawConstant
URI: http://qudt.org/vocab/constant/WienFrequencyDisplacementLawConstant
constant:WienWavelengthDisplacementLawConstant
URI: http://qudt.org/vocab/constant/WienWavelengthDisplacementLawConstant
vaem:GMD_QUDT-CONSTANTS
URI: http://www.linkedmodel.org/schema/vaem#GMD_QUDT-CONSTANTS
The Constants vocabulary defines terms for and contains the values and standard uncertainties of physical constants, initially populated from the NIST website: The NIST Reference on Constants, Units, and Uncertainty, at http://physics.nist.gov/cuu/index.html