QUDT VOCAB Physical Constants Release 3.1.0
Alpha particle-electron mass ratio
Alpha particle mass
alpha particle mass energy equivalent
Alpha particle mass energy equivalent in Me V
alpha particle mass in atomic mass unit
alpha particle molar mass
alpha particle-proton mass ratio
Angstrom star
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.
atomic mass constant
atomic mass constant energy equivalent
atomic mass constant energy equivalent in MeV
atomic mass unit-electron volt relationship
atomic mass unit-hartree relationship
atomic mass unit-hertz relationship
atomic mass unit-inverse meter relationship
atomic mass unit-inverse metre relationship
atomic mass unit-joule relationship
atomic mass unit-kelvin relationship
atomic mass unit-kilogram relationship
atomic unit of 1st hyperpolarizablity
atomic unit of 2nd hyperpolarizablity
atomic unit of action
atomic unit of charge
atomic unit of charge density
atomic unit of current
atomic unit of electric dipole mom.
atomic unit of electric field
atomic unit of electric field gradient
atomic unit of electric polarizablity
atomic unit of electric potential
atomic unit of electric quadrupole moment
atomic unit of energy
atomic unit of force
atomic unit of length
atomic unit of magnetic dipole moment
atomic unit of magnetic flux density
atomic unit of magnetizability
atomic unit of mass
atomic unit of momentum
atomic unit of permittivity
atomic unit of time
atomic unit of velocity
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.
$L = \frac{N}{n}$, where $N$ is the number of particles and $n$ is amount of substance.
Avogadro constant
The $\textit{Bohr Magneton}$ is a physical constant and the natural unit for expressing an electron magnetic dipole moment.
$\mu_B = \frac{e\hbar}{2m_e}$, where $e$ is the elementary charge, $\hbar$ is the Planck constant, and $m_e$ is the rest mass of electron.
Bohr Magneton
Bohr magneton in eV per T
Bohr magneton in Hz perT
Bohr magneton in inverse meters per tesla
Bohr magneton in inverse metres per tesla
Bohr magneton in K per T
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.
$a_0 = \frac{4\pi \varepsilon_0 \hbar^2}{m_ee^2}$, where $\varepsilon_0$ is the electric constant, $\hbar$ is the reduced Planck constant, $m_e$ is the rest mass of electron, and $e$ is the elementary charge.
Bohr Radius
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.
Boltzmann Constant
Boltzmann constant in eV per K
Boltzmann constant in Hz per K
Boltzmann constant in inverse meters per kelvin
Boltzmann constant in inverse metres per kelvin
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.
characteristic impedance of vacuum
classical electron radius
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.
$\lambda_C = \frac{h}{mc_0}$, where $h$ is the Planck constant, $m$ is the rest mass of a particle, and $c_0$ is the speed of light in vacuum.
Compton Wavelength
Compton wavelength over 2 pi
conductance quantum
conventional value of Josephson constant
conventional value of von Klitzing constant
Cu x unit
deuteron-electron magnetic moment ratio
deuteron-electron mass ratio
deuteron g factor
deuteron magnetic moment
deuteron magnetic moment to Bohr magneton ratio
deuteron magnetic moment to nuclear magneton ratio
deuteron mass
deuteron mass energy equivalent
deuteron mass energy equivalent in MeV
deuteron mass in atomic mass unit
deuteron molar mass
deuteron-neutron magnetic moment ratio
deuteron-proton magnetic moment ratio
deuteron-proton mass ratio
deuteron rms charge radius
electric constant
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, $\overrightarrow{B}$.
$\mu_0 = \frac{\overrightarrow{B}}{\overrightarrow{H}}$, where $\overrightarrow{B}$ is the B-Filed magnetic vector, and $\overrightarrow{H}$ is the H-Field magnetic vector. The value of $\mu_0$ is $\approx 1.256637e-6\,henry\,per\,metre$.
Permeability of Vacuum
electron charge to mass quotient
electron-deuteron magnetic moment ratio
electron-deuteron mass ratio
electron g factor
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.
$\mu = \gamma_e J$, where $\mu$ is the magnetic dipole moment, and $J$ is the total angular momentum.
Electron Gyromagnetic Ratio
electron gyromagnetic ratio over 2 pi
electron magnetic moment
electron magnetic moment anomaly
electron magnetic moment to Bohr magneton ratio
electron magnetic moment to nuclear magneton ratio
Electron Mass
electron mass energy equivalent
electron mass energy equivalent in MeV
electron mass in atomic mass unit
electron molar mass
electron-muon magnetic moment ratio
electron-muon mass ratio
electron-neutron magnetic moment ratio
electron-neutron mass ratio
electron-proton magnetic moment ratio
electron-proton mass ratio
electron-tau mass ratio
electron to alpha particle mass ratio
electron to shielded helion magnetic moment ratio
electron to shielded proton magnetic moment ratio
electron volt-atomic mass unit relationship
electron volt-hartree relationship
electron volt-hertz relationship
electron volt-inverse meter relationship
electron volt-inverse metre relationship
electron volt-joule relationship
electron volt-kelvin relationship
electron volt-kilogram relationship
The "Elementary Charge" is the electric charge carried by a single proton, or equivalently, the negation (opposite) of the electric charge carried by a single electron.
Elementary Charge
elementary charge over h
The $\textit{Faraday Constant}$ is a constant equal to the product of electrical elementary charge and Avogadro constant; this is approximately $9.64853321233100184 \times 10^{4}\ C/mol$.
$F = N_A e$, where $N_A$ is the Avogadro constant and $e$ is the elementary charge.
Physikalische Konstante, gleich dem Produkt aus elektrischer Elementarladung und Avogadro-Konstante; sie beträgt annähernd 96 485,3 C/mol
Faraday constant
Fermi coupling constant
The $\textit{Fine-structure Constant}$ is a fundamental physical constant, namely the coupling constant characterizing the strength of the electromagnetic interaction.
$a = \frac{e^2}{4\pi\varepsilon_0\hbar c_0}$, where $e$ is the elementary charge, $\varepsilon_0$ is the electric constant, item $\hbar$ is the reduced Planck constant, and $c_0$ is the speed of light in vacuum.
Fine-Structure Constant
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.
Konstante im Planckschen Strahlungsgesetz über die Abhängigkeit der spektralen Dichte verschiedener Strahlungsgrößen von der Wellenlänge der elektromagnetischen Strahlung und der absoluten Temperatur beim schwarzen Strahler, welche sich zusammensetzt aus dem Produkt zwei Pi mal Plancksches Wirkungsquantum mal dem Quadrat der Lichtgeschwindigkeit
first radiation constant
first radiation constant for spectral radiance
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.
Empirisch ermittelte Naturkonstante, die bei bekanntem Mittelpunktsabstand zweier kugelsymmetrischer Körper deren gegenseitige Massenanziehungskraft bestimmt
Gravitational constant
hartree-atomic mass unit relationship
hartree-electron volt relationship
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 $E_H = 4.35974394(22)\ \times 10^{-18}\ J = 27.21138386(68)\ eV$.
$E_H= \frac{e^2}{4\pi \varepsilon_0 a_0 }$, where $e$ is the elementary charge, $\varepsilon_0$ is the electric constant, and $a_0$ is the Bohr radius.
Hartree Energy
Hartree energy in eV
hartree-hertz relationship
hartree-inverse meter relationship
hartree-inverse metre relationship
hartree-joule relationship
hartree-kelvin relationship
hartree-kilogram relationship
helion-electron mass ratio
helion mass
helion mass energy equivalent
helion mass energy equivalent in MeV
helion mass in atomic mass unit
helion molar mass
helion-proton mass ratio
hertz-atomic mass unit relationship
hertz-electron volt relationship
hertz-hartree relationship
hertz-inverse meter relationship
hertz-inverse metre relationship
hertz-joule relationship
hertz-kelvin relationship
hertz-kilogram relationship
inverse fine-structure constant
inverse meter-atomic mass unit relationship
inverse metre-atomic mass unit relationship
inverse meter-electron volt relationship
inverse metre-electron volt relationship
inverse meter-hartree relationship
inverse metre-hartree relationship
inverse meter-hertz relationship
inverse metre-hertz relationship
inverse meter-joule relationship
inverse metre-joule relationship
inverse meter-kelvin relationship
inverse metre-kelvin relationship
inverse meter-kilogram relationship
inverse metre-kilogram relationship
inverse of conductance quantum
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 $h$.
$K_J = \frac{1}{\Phi_0}$, where $\Phi_0$ is the magnetic flux quantum.
Proportionalitätsfaktor zwischen elektrischer Spannung und Frequenz beim Wechselstrom entsprechend dem Produkt aus zwei Elementarladungen e und Planckschen Wirkungsquantum h
Josephson Constant
joule-atomic mass unit relationship
joule-electron volt relationship
joule-hartree relationship
joule-hertz relationship
joule-inverse meter relationship
joule-inverse metre relationship
joule-kelvin relationship
joule-kilogram relationship
kelvin-atomic mass unit relationship
kelvin-electron volt relationship
kelvin-hartree relationship
kelvin-hertz relationship
kelvin-inverse meter relationship
kelvin-inverse metre relationship
kelvin-joule relationship
kelvin-kilogram relationship
kilogram-atomic mass unit relationship
kilogram-electron volt relationship
kilogram-hartree relationship
kilogram-hertz relationship
kilogram-inverse meter relationship
kilogram-inverse metre relationship
Kilogram-Joule Relationship
kilogram-kelvin relationship
lattice parameter of silicon
lattice parametre of silicon
lattice spacing of silicon
Loschmidt constant 273.15 K 101.325 kPa
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, $\overrightarrow{B}$.
$\mu_0 = \frac{\overrightarrow{B}}{\overrightarrow{H}}$, where $\overrightarrow{B}$ is the B-Filed magnetic vector, and $\overrightarrow{H}$ is the H-Filed magnetic vector. The value of $\mu_0$ is $\approx 1.256637e-6\,H/M$.
Magnetic Constant
The constant $\textit{Magnetic Flux Quantum}$ is the quantum of magnetic flux passing through a superconductor.
$\Phi_0 = \frac{h}{2e}$, where $h$ is the Planck constant and $e$ is the elementary charge.
magnetic flux quantum
Mo x unit
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).
$pV_m = RT$, where $p$ is pressure, $V_m$ is molar volume, and $T$ is thermodynamic temperature.
molar gas constant
molar mass constant
molar mass of carbon-12
molar Planck constant
molar Planck constant times c
molar volume of ideal gas 273.15 K 100 kPa
molar volume of ideal gas 273.15 K 101.325 kPa
molar volume of silicon
muon Compton wavelength
muon Compton wavelength over 2 pi
muon-electron mass ratio
muon g factor
muon magnetic moment
muon magnetic moment anomaly
muon magnetic moment to Bohr magneton ratio
muon magnetic moment to nuclear magneton ratio
muon mass
muon mass energy equivalent
muon mass energy equivalent in MeV
muon mass in atomic mass unit
muon molar mass
muon-neutron mass ratio
muon-proton magnetic moment ratio
muon-proton mass ratio
muon-tau mass ratio
natural unit of action
natural unit of action in eV s
natural unit of energy
natural unit of energy in MeV
natural unit of length
natural unit of mass
natural unit of momentum
natural unit of momentum in MeV PER c
natural unit of time
natural unit of velocity
neutron Compton wavelength
neutron Compton wavelength over 2 pi
neutron-electron magnetic moment ratio
neutron-electron mass ratio
neutron g factor
neutron gyromagnetic ratio
neutron gyromagnetic ratio over 2 pi
neutron magnetic moment
neutron magnetic moment to Bohr magneton ratio
neutron magnetic moment to nuclear magneton ratio
neutron mass
neutron mass energy equivalent
neutron mass energy equivalent in MeV
neutron mass in atomic mass unit
neutron molar mass
neutron-muon mass ratio
neutron-proton magnetic moment ratio
neutron-proton mass ratio
neutron-tau mass ratio
neutron to shielded proton magnetic moment ratio
Newtonian constant of gravitation
The constant $\textit{Nuclear Magneton}$ is the natural unit for expressing magnetic dipole moments of heavy particles such as nucleons and atomic nuclei.
$\mu_N = \frac{e\hbar}{2m_p}$, where $e$ is the elementary charge, $\hbar$ is the Planck constant, and $m_p$ is the rest mass of proton.
Nuclear Magneton
nuclear magneton in eV per T
nuclear magneton in inverse meters per tesla
nuclear magneton in inverse metres per tesla
nuclear magneton in K per T
nuclear magneton in MHz per T
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 $\textit{Permittivity of Free Space}$.
$\epsilon = \frac{\mathbf{D}}{\mathbf{E}}$, where $\mathbf{D}$ is electric flux density and $\mathbf{E}$ is electric field strength.
Permittivity of Vacuum
The constant $\pi$ is the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159.
$\pi = \frac{C}{d}$, where $C$ is the circumference of a circle and $d$ is the diameter of a circle.
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.
$E = h\nu = \frac{hc}{\lambda}$, where $E$ is energy, $\nu$ is frequency, $\lambda$ is wavelength, and $c$ is the speed of light.
Planck Constant
Planck constant in eV s
Planck constant over 2 pi
Planck constant over 2 pi in eV s
Planck constant over 2 pi times c in MeV fm
Planck length
Planck mass
Planck mass energy equivalent in GeV
Planck temperature
Planck time
proton charge to mass quotient
proton Compton wavelength
proton Compton wavelength over 2 pi
proton-electron mass ratio
proton g factor
proton gyromagnetic ratio
proton gyromagnetic ratio over 2 pi
proton magnetic moment
proton magnetic moment to Bohr magneton ratio
proton magnetic moment to nuclear magneton ratio
proton mag. shielding correction
proton mass
proton mass energy equivalent
proton mass energy equivalent in MeV
proton mass in atomic mass unit
proton molar mass
proton-muon mass ratio
proton-neutron magnetic moment ratio
proton-neutron mass ratio
proton rms charge radius
proton-tau mass ratio
quantum of circulation
quantum of circulation times 2
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.
$\hbar = \frac{h}{2\pi}$, where $h$ is the Planck constant.
Reduced Planck Constant
The $\textit{Rydberg constant}$, named after the Swedish physicist Johannes Rydberg, is a physical constant relating to atomic spectra, in the science of spectroscopy.
$R_\infty = \frac{e^2}{8\pi \varepsilon_0 a_0 h c_0 }$, where $e$ is the elementary charge, $\varepsilon_0$ is the electric constant, $a_0$ is the Bohr radius, $h$ is the Planck constant, and $c_0$ is the speed of light in vacuum.
Rydberg Constant
Rydberg constant times c in Hz
Rydberg constant times hc in eV
Rydberg constant times hc in J
Sackur-Tetrode constant 1 K 100 kPa
Sackur-Tetrode constant 1 K 101.325 kPa
second radiation constant
shielded helion gyromagnetic ratio
shielded helion gyromagnetic ratio over 2 pi
shielded helion magnetic moment
shielded helion magnetic moment to Bohr magneton ratio
shielded helion magnetic moment to nuclear magneton ratio
shielded helion to proton magnetic moment ratio
shielded helion to shielded proton magnetic moment ratio
shielded proton gyromagnetic ratio
shielded proton gyromagnetic ratio over 2 pi
shielded proton magnetic moment
shielded proton magnetic moment to Bohr magneton ratio
shielded proton magnetic moment to nuclear magneton ratio
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.
$c_0 = 1 / \sqrt{\epsilon_0 \mu_0}$, where {\epsilon_0} is the permittivity of vacuum, and $\mu_0$ is the magnetic constant.
Speed of Light (vacuum)
standard acceleration of gravity
standard atmosphere
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.
Proportionalitätsfaktor zwischen der spezifischen Strahlungswärme eines schwarzen Strahlers und seiner absoluten Temperatur in der 4. Potenz
Stefan-Boltzmann Constant
tau Compton wavelength
tau Compton wavelength over 2 pi
tau-electron mass ratio
tau mass
tau mass energy equivalent
tau mass energy equivalent in MeV
tau mass in atomic mass unit
tau molar mass
tau-muon mass ratio
tau-neutron mass ratio
tau-proton mass ratio
Thomson cross section
triton-electron magnetic moment ratio
triton-electron mass ratio
triton g factor
triton magnetic moment
triton magnetic moment to Bohr magneton ratio
triton magnetic moment to nuclear magneton ratio
triton mass
triton mass energy equivalent
triton mass energy equivalent in MeV
triton mass in atomic mass unit
triton molar mass
triton-neutron magnetic moment ratio
triton-proton magnetic moment ratio
triton-proton mass ratio
unified atomic mass unit
The gas constant (also known as the molar, universal, or ideal gas constant) 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. Physically, the gas constant is the constant of proportionality that happens to relate the energy scale in physics to the temperature scale, when a mole of particles at the stated temperature is being considered.
Universal Gas Constant
Value for alpha particle-electron mass ratio
Value for alpha particle mass energy equivalent
Value for alpha particle mass energy equivalent in MeV
Value for alpha particle mass in atomic mass unit
Value for alpha particle-proton mass ratio
Value for atomic mass constant energy equivalent
Value for atomic mass constant energy equivalent in MeV
Value for atomic mass unit-electron volt relationship
Value for atomic mass unit-hartree relationship
Value for atomic mass unit-hertz relationship
Value for atomic mass unit-inverse meter relationship
Value for atomic mass unit-joule relationship
Value for atomic mass unit-kelvin relationship
Value for atomic mass unit-kilogram relationship
Value for atomic unit of 1st hyperpolarizability
Value for atomic unit of 2nd hyperpolarizability
Value for atomic unit of electric dipole mom.
Value for atomic unit of electric field gradient
Value for atomic unit of electric polarizability
Value for atomic unit of electric potential
Value for atomic unit of electric quadrupole moment
Value for atomic unit of magnetic dipole moment
Value for atomic unit of magnetic flux density
Value for atomic unit of magnetizability
Value for Bohr magneton in inverse meters per tesla
Value for Boltzmann constant in eV per K
Value for Boltzmann constant in Hz per K
Value for Boltzmann constant in inverse meters per kelvin
Value for characteristic impedance of vacuum
Value for conventional value of Josephson constant
Value for conventional value of von Klitzing constant
Value for deuteron-electron magnetic moment ratio
Value for deuteron magnetic moment to Bohr magneton ratio
Value for deuteron magnetic moment to nuclear magneton ratio
Value for deuteron mass energy equivalent
Value for deuteron mass energy equivalent in MeV
Value for deuteron-neutron magnetic moment ratio
Value for deuteron-proton magnetic moment ratio
Value for electron charge to mass quotient
Value for electron-deuteron magnetic moment ratio
Value for electron gyromagnetic ratio over 2 pi
Value for electron magnetic moment anomaly
Value for electron magnetic moment to Bohr magneton ratio
Value for electron magnetic moment to nuclear magneton ratio
Value for electron mass energy equivalent
Value for electron mass energy equivalent in MeV
Value for electron-muon magnetic moment ratio
Value for electron-neutron magnetic moment ratio
Value for electron-proton magnetic moment ratio
Value for electron to alpha particle mass ratio
Value for electron to shielded helion magnetic moment ratio
Value for electron to shielded proton magnetic moment ratio
Value for electron volt-atomic mass unit relationship
Value for electron volt-hartree relationship
Value for electron volt-hertz relationship
Value for electron volt-inverse meter relationship
Value for electron volt-joule relationship
Value for electron volt-kelvin relationship
Value for electron volt-kilogram relationship
Faraday constant for conventional electric current
Value for first radiation constant for spectral radiance
Value for hartree-atomic mass unit relationship
Value for hartree-electron volt relationship
Value for hartree-inverse meter relationship
Value for helion mass energy equivalent in MeV
Value for hertz-atomic mass unit relationship
Value for hertz-electron volt relationship
Value for hertz-inverse meter relationship
Value for inverse fine-structure constant
Value for inverse meter-atomic mass unit relationship
Value for inverse meter-electron volt relationship
Value for inverse meter-hartree relationship
Value for inverse meter-hertz relationship
Value for inverse meter-joule relationship
Value for inverse meter-kelvin relationship
Value for inverse meter-kilogram relationship
Value for inverse of conductance quantum
Value for joule-atomic mass unit relationship
Value for joule-electron volt relationship
Value for joule-inverse meter relationship
Value for kelvin-atomic mass unit relationship
Value for kelvin-electron volt relationship
Value for kelvin-inverse meter relationship
Value for kilogram-atomic mass unit relationship
Value for kilogram-electron volt relationship
Value for kilogram-inverse meter relationship
Value for Loschmidt constant 273.15 K 101.325 kPa
Value for molar volume of ideal gas 273.15 K 101.325 kPa
Value for muon Compton wavelength over 2 pi
Value for muon magnetic moment to Bohr magneton ratio
Value for muon magnetic moment to nuclear magneton ratio
Value for muon mass energy equivalent in MeV
Value for muon-proton magnetic moment ratio
Value for natural unit of action in eV s
Value for natural unit of momentum in MeV c^-1
Value for neutron Compton wavelength over 2 pi
Value for neutron-electron magnetic moment ratio
Value for neutron gyromagnetic ratio over 2 pi
Value for neutron magnetic moment to Bohr magneton ratio
Value for neutron magnetic moment to nuclear magneton ratio
Value for neutron mass energy equivalent
Value for neutron mass energy equivalent in MeV
Value for neutron-proton magnetic moment ratio
Value for neutron to shielded proton magnetic moment ratio
Value for Newtonian constant of gravitation
Newtonian constant of gravitation over hbar c
Value for nuclear magneton in inverse meters per tesla
Value for Planck constant over 2 pi in eV s
Value for Planck constant over 2 pi times c in MeV fm
Value for Planck mass energy equivalent in GeV
Value for proton charge to mass quotient
Value for proton Compton wavelength over 2 pi
Value for proton gyromagnetic ratio over 2 pi
Value for proton magnetic moment to Bohr magneton ratio
Value for proton magnetic moment to nuclear magneton ratio
Value for proton magnetic shielding correction
Value for proton mass energy equivalent in MeV
Value for proton-neutron magnetic moment ratio
Value for quantum of circulation times 2
Value for Rydberg constant times c in Hz
Value for Rydberg constant times hc in eV
Value for Rydberg constant times hc in J
Value for Sackur-Tetrode constant 1 K 100 kPa
Value for Sackur-Tetrode constant 1 K 101.325 kPa
Value for shielded helion gyromagnetic ratio
Value for shielded helion gyromagnetic ratio over 2 pi
Value for shielded helion magnetic moment
Value for shielded helion magnetic moment to Bohr magneton ratio
Value for shielded helion magnetic moment to nuclear magneton ratio
Value for shielded helion to proton magnetic moment ratio
Value for shielded helion to shielded proton magnetic moment ratio
Value for shielded proton gyromagnetic ratio
Value for shielded proton gyromagnetic ratio over 2 pi
Value for shielded proton magnetic moment
Value for shielded proton magnetic moment to Bohr magneton ratio
Value for shielded proton magnetic moment to nuclear magneton ratio
Value for speed of light in vacuum (Imperial units)
Value for standard acceleration of gravity
Value for tau Compton wavelength over 2 pi
Value for tau mass energy equivalent in MeV
Value for triton-electron magnetic moment ratio
Value for triton magnetic moment to Bohr magneton ratio
Value for triton magnetic moment to nuclear magneton ratio
Value for triton mass energy equivalent in MeV
Value for triton-neutron magnetic moment ratio
Value for triton-proton magnetic moment ratio
Value for Wien frequency displacement law constant
Value for Wien wavelength displacement law constant
Von Klitzing constant
Weak mixing angle
Wien frequency displacement law constant
Wien wavelength displacement law constant
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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
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