QUDT Constants Version 3.1.7

This version:

Latest published version: http://www.QUDT.org/doc/2025/10/DOC_VOCAB-CONSTANTS.html

Previous published version: https://qudt.org/doc/2025/09/DOC_VOCAB-CONSTANTS.html

Editor: Ralph Hodgson, TopQuadrant, Inc

Contributors: Irene Polikoff, Jack Hodges, Ralph Hodgson, Simon J D Cox, Steve Ray

Last Modified: 2025-10-27T20:16:21Z

Copyright © 2011 - 2025 QUDT.org , All Rights Reserved.

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Abstract

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

Table of Contents

  1. Resource Index
    1. Imported Graphs
    2. Non-imported Resources
  2. Resource Details
    1. Classes
    2. Properties
    3. Instances

Imported Graphs

A list of graphs imported by http://qudt.org/3.1.7/vocab/constant is shown below.

Graph URIIntent
http://qudt.org/3.1.7/schema/facade/qudt
http://qudt.org/3.1.7/vocab/unitTo provide a vocabulary of all units.

Non-imported Resources

The graph uses 5 resources from other graphs that are not imported, as listed below:

Resource Index

The main namespace for resources in this graph is http://qudt.org/vocab/constant/ with the prefix constant.

Classes

No Classes defined in this graph

Properties

No Properties defined in this graph

Instances

The graph defines, or extends, 663 instances, as indexed below:

Alpha particle-electron mass ratio
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alpha particle mass energy equivalent
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Alpha particle mass energy equivalent in Me V
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alpha particle mass in atomic mass unit
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alpha particle-proton mass ratio
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atomic mass constant energy equivalent
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atomic mass constant energy equivalent in MeV
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atomic mass unit-electron volt relationship
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atomic mass unit-hartree relationship
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atomic mass unit-hertz relationship
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atomic mass unit-inverse metre relationship
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atomic mass unit-joule relationship
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atomic mass unit-kelvin relationship
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atomic mass unit-kilogram relationship
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atomic unit of 1st hyperpolarizablity
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atomic unit of 2nd hyperpolarizablity
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atomic unit of charge density
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atomic unit of electric dipole mom.
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atomic unit of electric field
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atomic unit of electric field gradient
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atomic unit of electric polarizablity
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atomic unit of electric potential
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atomic unit of electric quadrupole moment
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atomic unit of magnetic dipole moment
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atomic unit of magnetic flux density
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Bohr magneton in inverse metres per tesla
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Boltzmann constant in eV per K
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Boltzmann constant in Hz per K
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Boltzmann constant in inverse metres per kelvin
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characteristic impedance of vacuum
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conventional value of Josephson constant
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conventional value of von Klitzing constant
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deuteron-electron magnetic moment ratio
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deuteron magnetic moment to Bohr magneton ratio
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deuteron magnetic moment to nuclear magneton ratio
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deuteron mass energy equivalent
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deuteron mass energy equivalent in MeV
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deuteron mass in atomic mass unit
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deuteron-neutron magnetic moment ratio
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deuteron-proton magnetic moment ratio
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electron charge to mass quotient
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electron-deuteron magnetic moment ratio
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electron gyromagnetic ratio over 2 pi
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electron magnetic moment anomaly
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electron magnetic moment to Bohr magneton ratio
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electron magnetic moment to nuclear magneton ratio
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electron mass energy equivalent
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electron mass energy equivalent in MeV
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electron mass in atomic mass unit
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electron-muon magnetic moment ratio
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electron-neutron magnetic moment ratio
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electron-proton magnetic moment ratio
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electron to alpha particle mass ratio
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electron to shielded helion magnetic moment ratio
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electron to shielded proton magnetic moment ratio
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electron volt-atomic mass unit relationship
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electron volt-hartree relationship
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electron volt-hertz relationship
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electron volt-inverse metre relationship
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electron volt-joule relationship
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electron volt-kelvin relationship
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electron volt-kilogram relationship
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first radiation constant for spectral radiance
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hartree-atomic mass unit relationship
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hartree-electron volt relationship
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hartree-inverse metre relationship
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helion mass energy equivalent in MeV
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helion mass in atomic mass unit
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hertz-atomic mass unit relationship
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hertz-electron volt relationship
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hertz-inverse metre relationship
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inverse fine-structure constant
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inverse metre-atomic mass unit relationship
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inverse metre-electron volt relationship
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inverse metre-hartree relationship
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inverse metre-hertz relationship
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inverse metre-joule relationship
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inverse metre-kelvin relationship
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inverse metre-kilogram relationship
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joule-atomic mass unit relationship
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joule-electron volt relationship
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joule-inverse metre relationship
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kelvin-atomic mass unit relationship
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kelvin-electron volt relationship
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kelvin-inverse metre relationship
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kilogram-atomic mass unit relationship
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kilogram-electron volt relationship
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kilogram-inverse metre relationship
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Loschmidt constant 273.15 K 101.325 kPa
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molar Planck constant times c
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molar volume of ideal gas 273.15 K 100 kPa
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molar volume of ideal gas 273.15 K 100 kPa
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molar volume of ideal gas 273.15 K 101.325 kPa
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molar volume of ideal gas 273.15 K 101.325 kPa
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muon Compton wavelength over 2 pi
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muon magnetic moment to Bohr magneton ratio
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muon magnetic moment to nuclear magneton ratio
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muon mass energy equivalent in MeV
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muon mass in atomic mass unit
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muon-proton magnetic moment ratio
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natural unit of action in eV s
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natural unit of energy in MeV
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natural unit of momentum in MeV PER c
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neutron Compton wavelength over 2 pi
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neutron-electron magnetic moment ratio
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neutron gyromagnetic ratio over 2 pi
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neutron magnetic moment to Bohr magneton ratio
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neutron magnetic moment to nuclear magneton ratio
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neutron mass energy equivalent in MeV
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neutron mass in atomic mass unit
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neutron-proton magnetic moment ratio
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neutron to shielded proton magnetic moment ratio
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Newtonian constant of gravitation
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nuclear magneton in eV per T
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nuclear magneton in inverse metres per tesla
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nuclear magneton in K per T
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nuclear magneton in MHz per T
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Planck constant over 2 pi in eV s
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Planck constant over 2 pi times c in MeV fm
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Planck mass energy equivalent in GeV
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proton charge to mass quotient
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proton Compton wavelength over 2 pi
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proton gyromagnetic ratio over 2 pi
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proton magnetic moment to Bohr magneton ratio
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proton magnetic moment to nuclear magneton ratio
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proton mass energy equivalent in MeV
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proton mass in atomic mass unit
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proton-neutron magnetic moment ratio
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quantum of circulation times 2
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Rydberg constant times c in Hz
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Rydberg constant times hc in eV
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Rydberg constant times hc in J
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Sackur-Tetrode constant 1 K 100 kPa
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Sackur-Tetrode constant 1 K 101.325 kPa
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shielded helion gyromagnetic ratio
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shielded helion gyromagnetic ratio over 2 pi
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shielded helion magnetic moment
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shielded helion magnetic moment to Bohr magneton ratio
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shielded helion magnetic moment to nuclear magneton ratio
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shielded helion to proton magnetic moment ratio
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shielded helion to shielded proton magnetic moment ratio
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shielded proton gyromagnetic ratio
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shielded proton gyromagnetic ratio over 2 pi
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shielded proton magnetic moment
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shielded proton magnetic moment to Bohr magneton ratio
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shielded proton magnetic moment to nuclear magneton ratio
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standard acceleration of gravity
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tau Compton wavelength over 2 pi
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tau mass energy equivalent in MeV
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tau mass in atomic mass unit
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triton-electron magnetic moment ratio
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triton magnetic moment to Bohr magneton ratio
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triton magnetic moment to nuclear magneton ratio
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triton mass energy equivalent in MeV
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triton mass in atomic mass unit
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triton-neutron magnetic moment ratio
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triton-proton magnetic moment ratio
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 [Value for alpha particle-electron mass ratio] 
 [Value for alpha particle mass] 
 [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 molar mass] 
 [Value for alpha particle-proton mass ratio] 
 [Value for Angstrom star] 
 [Value for atomic mass constant] 
 [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 action] 
 [Value for atomic unit of charge] 
 [Value for atomic unit of charge density] 
 [Value for atomic unit of current] 
 [Value for atomic unit of electric dipole mom.] 
 [Value for atomic unit of electric field] 
 [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 energy] 
 [Value for atomic unit of force] 
 [Value for atomic unit of length] 
 [Value for atomic unit of magnetic dipole moment] 
 [Value for atomic unit of magnetic flux density] 
 [Value for atomic unit of magnetizability] 
 [Value for atomic unit of mass] 
 [Value for atomic unit of momentum] 
 [Value for atomic unit of permittivity] 
 [Value for atomic unit of time] 
 [Value for atomic unit of velocity] 
 [Value for Avogadro constant] 
 [Value for Bohr magneton] 
 [Value for Bohr magneton in eV per T] 
 [Value for Bohr magneton in Hz perT] 
 [Value for Bohr magneton in inverse meters per tesla] 
 [Value for Bohr magneton in K per T] 
 [Value for Bohr radius] 
 [Value for Boltzmann constant] 
 [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 classical electron radius] 
 [Value for Compton wavelength] 
 [Value for Compton wavelength over 2 pi] 
 [Value for conductance quantum] 
 [Value for conventional value of Josephson constant] 
 [Value for conventional value of von Klitzing constant] 
 [Value for Cu x unit] 
 [Value for deuteron-electron magnetic moment ratio] 
 [Value for deuteron-electron mass ratio] 
 [Value for deuteron g factor] 
 [Value for deuteron magnetic moment] 
 [Value for deuteron magnetic moment to Bohr magneton ratio] 
 [Value for deuteron magnetic moment to nuclear magneton ratio] 
 [Value for deuteron mass] 
 [Value for deuteron mass energy equivalent] 
 [Value for deuteron mass energy equivalent in MeV] 
 [Value for deuteron molar mass] 
 [Value for deuteron-neutron magnetic moment ratio] 
 [Value for deuteron-proton magnetic moment ratio] 
 [Value for deuteron-proton mass ratio] 
 [Value for deuteron rms charge radius] 
 [Value for electric constant] 
 [Value for electron charge to mass quotient] 
 [Value for electron-deuteron magnetic moment ratio] 
 [Value for electron-deuteron mass ratio] 
 [Value for electron g factor] 
 [Value for electron gyromagnetic ratio] 
 [Value for electron gyromagnetic ratio over 2 pi] 
 [Value for electron magnetic moment] 
 [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] 
 [Value for electron mass energy equivalent] 
 [Value for electron mass energy equivalent in MeV] 
 [Value for electron molar mass] 
 [Value for electron-muon magnetic moment ratio] 
 [Value for electron-muon mass ratio] 
 [Value for electron-neutron magnetic moment ratio] 
 [Value for electron-neutron mass ratio] 
 [Value for electron-proton magnetic moment ratio] 
 [Value for electron-proton mass ratio] 
 [Value for electron-tau mass 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] 
 [Value for elementary charge] 
 [Value for elementary charge over h] 
 [Value for Faraday constant] 
 [Faraday constant for conventional electric current] 
 [Value for Fermi coupling constant] 
 [Value for fine-structure constant] 
 [Value for first radiation constant] 
 [Value for first radiation constant for spectral radiance] 
 [Value for gravitational constant] 
 [Value for hartree-atomic mass unit relationship] 
 [Value for hartree-electron volt relationship] 
 [Value for Hartree energy] 
 [Value for Hartree energy in eV] 
 [Value for hartree-hertz relationship] 
 [Value for hartree-inverse meter relationship] 
 [Value for hartree-joule relationship] 
 [Value for hartree-kelvin relationship] 
 [Value for hartree-kilogram relationship] 
 [Value for helion-electron mass ratio] 
 [Value for helion mass] 
 [Value for helion mass energy equivalent] 
 [Value for helion mass energy equivalent in MeV] 
 [Value for helion molar mass] 
 [Value for helion-proton mass ratio] 
 [Value for hertz-atomic mass unit relationship] 
 [Value for hertz-electron volt relationship] 
 [Value for hertz-hartree relationship] 
 [Value for hertz-inverse meter relationship] 
 [Value for hertz-joule relationship] 
 [Value for hertz-kelvin relationship] 
 [Value for hertz-kilogram 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 Josephson constant] 
 [Value for joule-atomic mass unit relationship] 
 [Value for joule-electron volt relationship] 
 [Value for joule-hartree relationship] 
 [Value for joule-hertz relationship] 
 [Value for joule-inverse meter relationship] 
 [Value for joule-kelvin relationship] 
 [Value for joule-kilogram relationship] 
 [Value for kelvin-atomic mass unit relationship] 
 [Value for kelvin-electron volt relationship] 
 [Value for kelvin-hartree relationship] 
 [Value for kelvin-hertz relationship] 
 [Value for kelvin-inverse meter relationship] 
 [Value for kelvin-joule relationship] 
 [Value for kelvin-kilogram relationship] 
 [Value for kilogram-atomic mass unit relationship] 
 [Value for kilogram-electron volt relationship] 
 [Value for kilogram-hartree relationship] 
 [Value for kilogram-hertz relationship] 
 [Value for kilogram-inverse meter relationship] 
 [Value for kilogram-joule relationship] 
 [Value for kilogram-kelvin relationship] 
 [Value for lattice parameter of silicon] 
 [Value for lattice spacing of silicon] 
 [Value for Loschmidt constant 273.15 K 101.325 kPa] 
 [Value for magnetic constant] 
 [Value for magnetic flux quantum] 
 [Value for Mo x unit] 
 [Value for molar gas constant] 
 [Value for molar mass constant] 
 [Value for molar mass of carbon-12] 
 [Value for molar Planck constant] 
 [Value for molar Planck constant times c] 
 [Value for molar volume of ideal gas 273.15 K 101.325 kPa] 
 [Value for molar volume of ideal gas 273.15 K 101.325 kPa] 
 [Value for molar volume of ideal gas 273.15 K 101.325 kPa] 
 [Value for molar volume of silicon] 
 [Value for muon Compton wavelength] 
 [Value for muon Compton wavelength over 2 pi] 
 [Value for muon-electron mass ratio] 
 [Value for muon g factor] 
 [Value for muon magnetic moment] 
 [Value for muon magnetic moment anomaly] 
 [Value for muon magnetic moment to Bohr magneton ratio] 
 [Value for muon magnetic moment to nuclear magneton ratio] 
 [Value for muon mass] 
 [Value for muon mass energy equivalent] 
 [Value for muon mass energy equivalent in MeV] 
 [Value for muon molar mass] 
 [Value for muon-neutron mass ratio] 
 [Value for muon-proton magnetic moment ratio] 
 [Value for muon-proton mass ratio] 
 [Value for muon-tau mass ratio] 
 [Value for natural unit of action] 
 [Value for natural unit of action in eV s] 
 [Value for natural unit of energy] 
 [Value for natural unit of energy in MeV] 
 [Value for natural unit of length] 
 [Value for natural unit of mass] 
 [Value for natural unit of momentum] 
 [Value for natural unit of momentum in MeV c^-1] 
 [Value for natural unit of time] 
 [Value for natural unit of velocity] 
 [Value for neutron Compton wavelength] 
 [Value for neutron Compton wavelength over 2 pi] 
 [Value for neutron-electron magnetic moment ratio] 
 [Value for neutron-electron mass ratio] 
 [Value for neutron g factor] 
 [Value for neutron gyromagnetic ratio] 
 [Value for neutron gyromagnetic ratio over 2 pi] 
 [Value for neutron magnetic moment] 
 [Value for neutron magnetic moment to Bohr magneton ratio] 
 [Value for neutron magnetic moment to nuclear magneton ratio] 
 [Value for neutron mass] 
 [Value for neutron mass energy equivalent] 
 [Value for neutron mass energy equivalent in MeV] 
 [Value for neutron molar mass] 
 [Value for neutron-muon mass ratio] 
 [Value for neutron-proton magnetic moment ratio] 
 [Value for neutron-proton mass ratio] 
 [Value for neutron-tau mass 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] 
 [Value for nuclear magneton in eV per T] 
 [Value for nuclear magneton in inverse meters per tesla] 
 [Value for nuclear magneton in K per T] 
 [Value for nuclear magneton in MHz per T] 
 [Value for permittivity of vacuum] 
 [Value for Pi] 
 [Value for Planck constant] 
 [Value for Planck constant in eV s] 
 [Value for Planck constant over 2 pi] 
 [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 length] 
 [Value for Planck mass] 
 [Value for Planck mass energy equivalent in GeV] 
 [Value for Planck temperature] 
 [Value for Planck time] 
 [Value for proton charge to mass quotient] 
 [Value for proton Compton wavelength] 
 [Value for proton Compton wavelength over 2 pi] 
 [Value for proton-electron mass ratio] 
 [Value for proton g factor] 
 [Value for proton gyromagnetic ratio] 
 [Value for proton gyromagnetic ratio over 2 pi] 
 [Value for proton magnetic moment] 
 [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] 
 [Value for proton mass energy equivalent] 
 [Value for proton mass energy equivalent in MeV] 
 [Value for proton molar mass] 
 [Value for proton-muon mass ratio] 
 [Value for proton-neutron magnetic moment ratio] 
 [Value for proton-neutron mass ratio] 
 [Value for proton rms charge radius] 
 [Value for proton-tau mass ratio] 
 [Value for quantum of circulation] 
 [Value for quantum of circulation times 2] 
 [Value for Rydberg constant] 
 [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 second radiation constant] 
 [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 velocity of light] 
 [Value for speed of light in a vacuum] 
 [Value for speed of light in vacuum (Imperial units)] 
 [Value for standard acceleration of gravity] 
 [Value for standard atmosphere] 
 [Value for Stefan-Boltzmann Constant] 
 [Value for tau Compton wavelength] 
 [Value for tau Compton wavelength over 2 pi] 
 [Value for tau-electron mass ratio] 
 [Value for tau mass] 
 [Value for tau mass energy equivalent] 
 [Value for tau mass energy equivalent in MeV] 
 [Value for tau molar mass] 
 [Value for tau-muon mass ratio] 
 [Value for tau-neutron mass ratio] 
 [Value for tau-proton mass ratio] 
 [Value for Thomson cross section] 
 [Value for triton-electron magnetic moment ratio] 
 [Value for triton-electron mass ratio] 
 [Value for triton g factor] 
 [Value for triton magnetic moment] 
 [Value for triton magnetic moment to Bohr magneton ratio] 
 [Value for triton magnetic moment to nuclear magneton ratio] 
 [Value for triton mass] 
 [Value for triton mass energy equivalent] 
 [Value for triton mass energy equivalent in MeV] 
 [Value for triton molar mass] 
 [Value for triton-neutron magnetic moment ratio] 
 [Value for triton-proton magnetic moment ratio] 
 [Value for triton-proton mass ratio] 
 [Value for unified atomic mass unit] 
 [Value for von Klitzing constant] 
 [Value for weak mixing angle] 
 [Value for Wien frequency displacement law constant] 
 [Value for Wien wavelength displacement law constant] 
Wien frequency displacement law constant
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Wien wavelength displacement law constant
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 [Physical Constant Vocabulary Version 3.1.7 Metadata] 

Restricted Datatypes

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