The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants in the category " All constants "...

alpha particle mass
alpha particle mass energy equivalent
alpha particle mass energy equivalent in MeV
alpha particle mass in u
alpha particle molar mass
alpha particle-electron mass ratio
alpha particle-proton mass ratio
Angstrom star
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-joule relationship
atomic mass unit-kelvin relationship
atomic mass unit-kilogram relationship
atomic unit of 1st hyperpolarizability
atomic unit of 2nd hyperpolarizability
atomic unit of action
atomic unit of charge
atomic unit of charge density
atomic unit of current
atomic unit of electric dipole moment
atomic unit of electric field
atomic unit of electric field gradient
atomic unit of electric polarizability
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
Avogadro constant
Bohr magneton
Bohr magneton in eV/T
Bohr magneton in Hz/T
Bohr magneton in inverse meters per tesla
Bohr magneton in K/T
Bohr radius
Boltzmann constant
Boltzmann constant in eV/K
Boltzmann constant in Hz/K
Boltzmann constant in inverse meters per kelvin
characteristic impedance of vacuum
classical electron radius
Compton wavelength
Compton wavelength over 2 pi
conductance quantum
conventional value of Josephson constant
conventional value of von Klitzing constant
Cu x unit
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 u
deuteron molar mass
deuteron rms charge radius
deuteron-electron magnetic moment ratio
deuteron-electron mass ratio
deuteron-neutron magnetic moment ratio
deuteron-proton magnetic moment ratio
deuteron-proton mass ratio
electric constant
electron charge to mass quotient
electron g factor
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 u
electron molar mass
electron to alpha particle mass ratio
electron to shielded helion magnetic moment ratio
electron to shielded proton magnetic moment ratio
electron volt
electron volt-atomic mass unit relationship
electron volt-hartree relationship
electron volt-hertz relationship
electron volt-inverse meter relationship
electron volt-joule relationship
electron volt-kelvin relationship
electron volt-kilogram relationship
electron-deuteron magnetic moment ratio
electron-deuteron mass ratio
electron-helion mass ratio
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-triton mass ratio
elementary charge
elementary charge over h
Faraday constant
Faraday constant for conventional electric current
Fermi coupling constant
fine-structure constant
first radiation constant
first radiation constant for spectral radiance
Hartree energy
Hartree energy in eV
hartree-atomic mass unit relationship
hartree-electron volt relationship
hartree-hertz relationship
hartree-inverse meter relationship
hartree-joule relationship
hartree-kelvin relationship
hartree-kilogram relationship
helion g factor
helion magnetic moment
helion magnetic moment to Bohr magneton ratio
helion magnetic moment to nuclear magneton ratio
helion mass
helion mass energy equivalent
helion mass energy equivalent in MeV
helion mass in u
helion molar mass
helion-electron mass ratio
helion-proton mass ratio
hertz-atomic mass unit relationship
hertz-electron volt relationship
hertz-hartree relationship
hertz-inverse meter relationship
hertz-joule relationship
hertz-kelvin relationship
hertz-kilogram relationship
inverse fine-structure constant
inverse meter-atomic mass unit relationship
inverse meter-electron volt relationship
inverse meter-hartree relationship
inverse meter-hertz relationship
inverse meter-joule relationship
inverse meter-kelvin relationship
inverse meter-kilogram relationship
inverse of conductance quantum
Josephson constant
joule-atomic mass unit relationship
joule-electron volt relationship
joule-hartree relationship
joule-hertz relationship
joule-inverse meter 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-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-joule relationship
kilogram-kelvin relationship
lattice parameter of silicon
Loschmidt constant (273.15 K, 100 kPa)
Loschmidt constant (273.15 K, 101.325 kPa)
magnetic constant
magnetic flux quantum
Mo x unit
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 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 u
muon molar mass
muon-electron mass ratio
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/c
natural unit of time
natural unit of velocity
neutron Compton wavelength
neutron Compton wavelength over 2 pi
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 u
neutron molar mass
neutron to shielded proton magnetic moment ratio
neutron-electron magnetic moment ratio
neutron-electron mass ratio
neutron-muon mass ratio
neutron-proton magnetic moment ratio
neutron-proton mass difference
neutron-proton mass difference energy equivalent
neutron-proton mass difference energy equivalent in MeV
neutron-proton mass difference in u
neutron-proton mass ratio
neutron-tau mass ratio
Newtonian constant of gravitation
Newtonian constant of gravitation over h-bar c
nuclear magneton
nuclear magneton in eV/T
nuclear magneton in inverse meters per tesla
nuclear magneton in K/T
nuclear magneton in MHz/T
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 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 magnetic shielding correction
proton mass
proton mass energy equivalent
proton mass energy equivalent in MeV
proton mass in u
proton molar mass
proton rms charge radius
proton-electron mass ratio
proton-muon mass ratio
proton-neutron magnetic moment ratio
proton-neutron mass ratio
proton-tau mass ratio
quantum of circulation
quantum of circulation times 2
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
speed of light in vacuum
standard acceleration of gravity
standard atmosphere
standard-state pressure
Stefan-Boltzmann constant
tau Compton wavelength
tau Compton wavelength over 2 pi
tau mass
tau mass energy equivalent
tau mass energy equivalent in MeV
tau mass in u
tau molar mass
tau-electron mass ratio
tau-muon mass ratio
tau-neutron mass ratio
tau-proton mass ratio
Thomson cross section
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 u
triton molar mass
triton-electron mass ratio
triton-proton mass ratio
unified atomic mass unit
von Klitzing constant
weak mixing angle
Wien frequency displacement law constant
Wien wavelength displacement law constant
{220} lattice spacing of silicon


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