Physical Constants

Physical constants in PSI4

Label	Value	Description
_220_lattice_spacing_of_silicon	1.920155714E-10	{220} lattice spacing of silicon [m] uncertainty=0.000 0032 e-12
alpha_particle_electron_mass_ratio	7294.29954136	alpha particle-electron mass ratio [] uncertainty=0.000 000 24
alpha_particle_mass	6.644657230E-27	alpha particle mass [kg] uncertainty=0.000 000 082 e-27
alpha_particle_mass_energy_equivalent	5.971920097E-10	alpha particle mass energy equivalent [J] uncertainty=0.000 000 073 e-10
alpha_particle_mass_energy_equivalent_in_MeV	3727.379378	alpha particle mass energy equivalent in MeV [MeV] uncertainty=0.000 023
alpha_particle_mass_in_u	4.001506179127	alpha particle mass in u [u] uncertainty=0.000 000 000 063
alpha_particle_molar_mass	0.004001506179127	alpha particle molar mass [kg mol^{-1}] uncertainty=0.000 000 000 063 e-3
alpha_particle_proton_mass_ratio	3.97259968907	alpha particle-proton mass ratio [] uncertainty=0.000 000 000 36
Angstrom_star	1.00001495E-10	Angstrom star [m] uncertainty=0.000 000 90 e-10
atomic_mass_constant	1.660539040E-27	atomic mass constant [kg] uncertainty=0.000 000 020 e-27
atomic_mass_constant_energy_equivalent	1.492418062E-10	atomic mass constant energy equivalent [J] uncertainty=0.000 000 018 e-10
atomic_mass_constant_energy_equivalent_in_MeV	931.4940954	atomic mass constant energy equivalent in MeV [MeV] uncertainty=0.000 0057
atomic_mass_unit_electron_volt_relationship	931494095.4	atomic mass unit-electron volt relationship [eV] uncertainty=0.000 0057 e6
atomic_mass_unit_hartree_relationship	34231776.902	atomic mass unit-hartree relationship [E_h] uncertainty=0.000 000 0016 e7
atomic_mass_unit_hertz_relationship	2.2523427206E+23	atomic mass unit-hertz relationship [Hz] uncertainty=0.000 000 0010 e23
atomic_mass_unit_inverse_meter_relationship	7.5130066166E+14	atomic mass unit-inverse meter relationship [m^{-1}] uncertainty=0.000 000 0034 e14
atomic_mass_unit_joule_relationship	1.492418062E-10	atomic mass unit-joule relationship [J] uncertainty=0.000 000 018 e-10
atomic_mass_unit_kelvin_relationship	1.08095438E+13	atomic mass unit-kelvin relationship [K] uncertainty=0.000 000 62 e13
atomic_mass_unit_kilogram_relationship	1.660539040E-27	atomic mass unit-kilogram relationship [kg] uncertainty=0.000 000 020 e-27
atomic_unit_of_1st_hyperpolarizability	3.206361329E-53	atomic unit of 1st hyperpolarizability [C^3 m^3 J^{-2}] uncertainty=0.000 000 020 e-53
atomic_unit_of_2nd_hyperpolarizability	6.235380085E-65	atomic unit of 2nd hyperpolarizability [C^4 m^4 J^{-3}] uncertainty=0.000 000 077 e-65
atomic_unit_of_action	1.054571800E-34	atomic unit of action [J s] uncertainty=0.000 000 013 e-34
atomic_unit_of_charge	1.6021766208E-19	atomic unit of charge [C] uncertainty=0.000 000 0098 e-19
atomic_unit_of_charge_density	1.0812023770E+12	atomic unit of charge density [C m^{-3}] uncertainty=0.000 000 0067 e12
atomic_unit_of_current	0.006623618183	atomic unit of current [A] uncertainty=0.000 000 041 e-3
atomic_unit_of_electric_dipole_mom	8.478353552E-30	atomic unit of electric dipole mom. [C m] uncertainty=0.000 000 052 e-30
atomic_unit_of_electric_field	5.142206707E+11	atomic unit of electric field [V m^{-1}] uncertainty=0.000 000 032 e11
atomic_unit_of_electric_field_gradient	9.717362356E+21	atomic unit of electric field gradient [V m^{-2}] uncertainty=0.000 000 060 e21
atomic_unit_of_electric_polarizability	1.6487772731E-41	atomic unit of electric polarizability [C^2 m^2 J^{-1}] uncertainty=0.000 000 0011 e-41
atomic_unit_of_electric_potential	27.21138602	atomic unit of electric potential [V] uncertainty=0.000 000 17
atomic_unit_of_electric_quadrupole_mom	4.486551484E-40	atomic unit of electric quadrupole mom. [C m^2] uncertainty=0.000 000 028 e-40
atomic_unit_of_energy	4.359744650E-18	atomic unit of energy [J] uncertainty=0.000 000 054 e-18
atomic_unit_of_force	8.23872336E-8	atomic unit of force [N] uncertainty=0.000 000 10 e-8
atomic_unit_of_length	5.2917721067E-11	atomic unit of length [m] uncertainty=0.000 000 000 12 e-10
atomic_unit_of_mag_dipole_mom	1.854801999E-23	atomic unit of mag. dipole mom. [J T^{-1}] uncertainty=0.000 000 011 e-23
atomic_unit_of_mag_flux_density	235051.7550	atomic unit of mag. flux density [T] uncertainty=0.000 000 014 e5
atomic_unit_of_magnetizability	7.8910365886E-29	atomic unit of magnetizability [J T^{-2}] uncertainty=0.000 000 0090 e-29
atomic_unit_of_mass	9.10938356E-31	atomic unit of mass [kg] uncertainty=0.000 000 11 e-31
atomic_unit_of_momum	1.992851882E-24	atomic unit of mom.um [kg m s^{-1}] uncertainty=0.000 000 024 e-24
atomic_unit_of_permittivity	1.112650056E-10	atomic unit of permittivity [F m^{-1}] uncertainty=(exact)
atomic_unit_of_time	2.418884326509E-17	atomic unit of time [s] uncertainty=0.000 000 000 014 e-17
atomic_unit_of_velocity	2187691.26277	atomic unit of velocity [m s^{-1}] uncertainty=0.000 000 000 50 e6
Avogadro_constant	6.022140857E+23	Avogadro constant [mol^{-1}] uncertainty=0.000 000 074 e23
Bohr_magneton	9.274009994E-24	Bohr magneton [J T^{-1}] uncertainty=0.000 0057 e-26
Bohr_magneton_in_eVpT	0.000057883818012	Bohr magneton in eV/T [eV T^{-1}] uncertainty=0.000 000 0026 e-5
Bohr_magneton_in_HzpT	13996245042	Bohr magneton in Hz/T [Hz T^{-1}] uncertainty=0.000 000 086 e9
Bohr_magneton_in_inverse_meters_per_tesla	46.68644814	Bohr magneton in inverse meters per tesla [m^{-1} T^{-1}] uncertainty=0.000 000 29
Bohr_magneton_in_KpT	0.67171405	Bohr magneton in K/T [K T^{-1}] uncertainty=0.000 000 39
Bohr_radius	5.2917721067E-11	Bohr radius [m] uncertainty=0.000 000 000 12 e-10
Boltzmann_constant	1.38064852E-23	Boltzmann constant [J K^{-1}] uncertainty=0.000 000 79 e-23
Boltzmann_constant_in_eVpK	0.000086173303	Boltzmann constant in eV/K [eV K^{-1}] uncertainty=0.000 0050 e-5
Boltzmann_constant_in_HzpK	2.0836612E+10	Boltzmann constant in Hz/K [Hz K^{-1}] uncertainty=0.000 0012 e10
Boltzmann_constant_in_inverse_meters_per_kelvin	69.503457	Boltzmann constant in inverse meters per kelvin [m^{-1} K^{-1}] uncertainty=0.000 040
characteristic_impedance_of_vacuum	376.730313461	characteristic impedance of vacuum [ohm] uncertainty=(exact)
classical_electron_radius	2.8179403227E-15	classical electron radius [m] uncertainty=0.000 000 0019 e-15
Compton_wavelength	2.4263102367E-12	Compton wavelength [m] uncertainty=0.000 000 0011 e-12
Compton_wavelength_over_2_pi	3.8615926764E-13	Compton wavelength over 2 pi [m] uncertainty=0.000 000 18 e-15
conductance_quantum	0.000077480917310	conductance quantum [S] uncertainty=0.000 000 0018 e-5
conventional_value_of_Josephson_constant	4.835979E+14	conventional value of Josephson constant [Hz V^{-1}] uncertainty=(exact)
conventional_value_of_von_Klitzing_constant	25812.807	conventional value of von Klitzing constant [ohm] uncertainty=(exact)
Cu_x_unit	1.00207697E-13	Cu x unit [m] uncertainty=0.000 000 28 e-13
deuteron_electron_mag_mom_ratio	-0.0004664345535	deuteron-electron mag. mom. ratio [] uncertainty=0.000 000 026 e-4
deuteron_electron_mass_ratio	3670.48296785	deuteron-electron mass ratio [] uncertainty=0.000 000 13
deuteron_g_factor	0.8574382311	deuteron g factor [] uncertainty=0.000 000 0048
deuteron_mag_mom	4.330735040E-27	deuteron mag. mom. [J T^{-1}] uncertainty=0.000 000 0036 e-26
deuteron_mag_mom_to_Bohr_magneton_ratio	0.0004669754554	deuteron mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 0026 e-3
deuteron_mag_mom_to_nuclear_magneton_ratio	0.8574382311	deuteron mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 0048
deuteron_mass	3.343583719E-27	deuteron mass [kg] uncertainty=0.000 000 041 e-27
deuteron_mass_energy_equivalent	3.005063183E-10	deuteron mass energy equivalent [J] uncertainty=0.000 000 037 e-10
deuteron_mass_energy_equivalent_in_MeV	1875.612928	deuteron mass energy equivalent in MeV [MeV] uncertainty=0.000 012
deuteron_mass_in_u	2.013553212745	deuteron mass in u [u] uncertainty=0.000 000 000 040
deuteron_molar_mass	0.002013553212745	deuteron molar mass [kg mol^{-1}] uncertainty=0.000 000 000 040 e-3
deuteron_neutron_mag_mom_ratio	-0.44820652	deuteron-neutron mag. mom. ratio [] uncertainty=0.000 000 11
deuteron_proton_mag_mom_ratio	0.3070122077	deuteron-proton mag. mom. ratio [] uncertainty=0.000 000 0015
deuteron_proton_mass_ratio	1.99900750087	deuteron-proton mass ratio [] uncertainty=0.000 000 000 19
deuteron_rms_charge_radius	2.1413E-15	deuteron rms charge radius [m] uncertainty=0.0025 e-15
electric_constant	8.854187817E-12	electric constant [F m^{-1}] uncertainty=(exact)
electron_charge_to_mass_quotient	-1.758820024E+11	electron charge to mass quotient [C kg^{-1}] uncertainty=0.000 000 011 e11
electron_deuteron_mag_mom_ratio	-2143.923499	electron-deuteron mag. mom. ratio [] uncertainty=0.000 012
electron_deuteron_mass_ratio	0.0002724437107484	electron-deuteron mass ratio [] uncertainty=0.000 000 000 096 e-4
electron_g_factor	-2.00231930436182	electron g factor [] uncertainty=0.000 000 000 000 52
electron_gyromag_ratio	1.760859644E+11	electron gyromag. ratio [s^{-1} T^{-1}] uncertainty=0.000 000 011 e11
electron_gyromag_ratio_over_2_pi	28024.95164	electron gyromag. ratio over 2 pi [MHz T^{-1}] uncertainty=0.000 17
electron_helion_mass_ratio	0.0001819543074854	electron-helion mass ratio [] uncertainty=0.000 000 000 088 e-4
electron_mag_mom	-9.284764620E-24	electron mag. mom. [J T^{-1}] uncertainty=0.000 0057 e-26
electron_mag_mom_anomaly	0.00115965218091	electron mag. mom. anomaly [] uncertainty=0.000 000 000 26 e-3
electron_mag_mom_to_Bohr_magneton_ratio	-1.00115965218091	electron mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 000 000 26
electron_mag_mom_to_nuclear_magneton_ratio	-1838.28197234	electron mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 17
electron_mass	9.10938356E-31	electron mass [kg] uncertainty=0.000 000 11 e-31
electron_mass_energy_equivalent	8.18710565E-14	electron mass energy equivalent [J] uncertainty=0.000 000 10 e-14
electron_mass_energy_equivalent_in_MeV	0.5109989461	electron mass energy equivalent in MeV [MeV] uncertainty=0.000 000 0031
electron_mass_in_u	0.000548579909070	electron mass in u [u] uncertainty=0.000 000 000 16 e-4
electron_molar_mass	5.48579909070E-7	electron molar mass [kg mol^{-1}] uncertainty=0.000 000 000 16 e-7
electron_muon_mag_mom_ratio	206.7669880	electron-muon mag. mom. ratio [] uncertainty=0.000 0046
electron_muon_mass_ratio	0.00483633170	electron-muon mass ratio [] uncertainty=0.000 000 11 e-3
electron_neutron_mag_mom_ratio	960.92050	electron-neutron mag. mom. ratio [] uncertainty=0.000 23
electron_neutron_mass_ratio	0.00054386734428	electron-neutron mass ratio [] uncertainty=0.000 000 0027 e-4
electron_proton_mag_mom_ratio	-658.2106866	electron-proton mag. mom. ratio [] uncertainty=0.000 0020
electron_proton_mass_ratio	0.000544617021352	electron-proton mass ratio [] uncertainty=0.000 000 000 52 e-4
electron_tau_mass_ratio	0.000287592	electron-tau mass ratio [] uncertainty=0.000 26 e-4
electron_to_alpha_particle_mass_ratio	0.0001370933554798	electron to alpha particle mass ratio [] uncertainty=0.000 000 000 045 e-4
electron_to_shielded_helion_mag_mom_ratio	864.058257	electron to shielded helion mag. mom. ratio [] uncertainty=0.000 010
electron_to_shielded_proton_mag_mom_ratio	-658.2275971	electron to shielded proton mag. mom. ratio [] uncertainty=0.000 0072
electron_triton_mass_ratio	0.0001819200062203	electron-triton mass ratio [] uncertainty=0.000 000 000 084 e-4
electron_volt	1.6021766208E-19	electron volt [J] uncertainty=0.000 000 0098 e-19
electron_volt_atomic_mass_unit_relationship	1.0735441105E-9	electron volt-atomic mass unit relationship [u] uncertainty=0.000 000 0066 e-9
electron_volt_hartree_relationship	0.03674932248	electron volt-hartree relationship [E_h] uncertainty=0.000 000 023 e-2
electron_volt_hertz_relationship	2.417989262E+14	electron volt-hertz relationship [Hz] uncertainty=0.000 000 015 e14
electron_volt_inverse_meter_relationship	806554.4005	electron volt-inverse meter relationship [m^{-1}] uncertainty=0.000 000 050 e5
electron_volt_joule_relationship	1.6021766208E-19	electron volt-joule relationship [J] uncertainty=0.000 000 0098 e-19
electron_volt_kelvin_relationship	11604.5221	electron volt-kelvin relationship [K] uncertainty=0.000 000 67 e4
electron_volt_kilogram_relationship	1.782661907E-36	electron volt-kilogram relationship [kg] uncertainty=0.000 000 011 e-36
elementary_charge	1.6021766208E-19	elementary charge [C] uncertainty=0.000 000 0098 e-19
elementary_charge_over_h	2.417989262E+14	elementary charge over h [A J^{-1}] uncertainty=0.000 000 015 e14
Faraday_constant	96485.33289	Faraday constant [C mol^{-1}] uncertainty=0.000 59
Faraday_constant_for_conventional_electric_current	96485.3251	Faraday constant for conventional electric current [C_{90} mol^{-1}] uncertainty=0.0012
Fermi_coupling_constant	0.000011663787	Fermi coupling constant [GeV^{-2}] uncertainty=0.000 0006 e-5
fine_structure_constant	0.0072973525664	fine-structure constant [] uncertainty=0.000 000 0017 e-3
first_radiation_constant	3.741771790E-16	first radiation constant [W m^2] uncertainty=0.000 000 046 e-16
first_radiation_constant_for_spectral_radiance	1.191042953E-16	first radiation constant for spectral radiance [W m^2 sr^{-1}] uncertainty=0.000 000 015 e-16
hartree_atomic_mass_unit_relationship	2.9212623197E-8	hartree-atomic mass unit relationship [u] uncertainty=0.000 000 0013 e-8
hartree_electron_volt_relationship	27.21138602	hartree-electron volt relationship [eV] uncertainty=0.000 000 17
Hartree_energy	4.359744650E-18	Hartree energy [J] uncertainty=0.000 000 054 e-18
Hartree_energy_in_eV	27.21138602	Hartree energy in eV [eV] uncertainty=0.000 000 17
hartree_hertz_relationship	6.579683920711E+15	hartree-hertz relationship [Hz] uncertainty=0.000 000 000 039 e15
hartree_inverse_meter_relationship	21947463.13702	hartree-inverse meter relationship [m^{-1}] uncertainty=0.000 000 000 013 e7
hartree_joule_relationship	4.359744650E-18	hartree-joule relationship [J] uncertainty=0.000 000 054 e-18
hartree_kelvin_relationship	315775.13	hartree-kelvin relationship [K] uncertainty=0.000 0018 e5
hartree_kilogram_relationship	4.850870129E-35	hartree-kilogram relationship [kg] uncertainty=0.000 000 060 e-35
helion_electron_mass_ratio	5495.88527922	helion-electron mass ratio [] uncertainty=0.000 000 27
helion_g_factor	-4.255250616	helion g factor [] uncertainty=0.000 000 050
helion_mag_mom	-1.074617522E-26	helion mag. mom. [J T^{-1}] uncertainty=0.000 000 014 e-26
helion_mag_mom_to_Bohr_magneton_ratio	-0.001158740958	helion mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 014 e-3
helion_mag_mom_to_nuclear_magneton_ratio	-2.127625308	helion mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 025
helion_mass	5.006412700E-27	helion mass [kg] uncertainty=0.000 000 062 e-27
helion_mass_energy_equivalent	4.499539341E-10	helion mass energy equivalent [J] uncertainty=0.000 000 055 e-10
helion_mass_energy_equivalent_in_MeV	2808.391586	helion mass energy equivalent in MeV [MeV] uncertainty=0.000 017
helion_mass_in_u	3.01493224673	helion mass in u [u] uncertainty=0.000 000 000 12
helion_molar_mass	0.00301493224673	helion molar mass [kg mol^{-1}] uncertainty=0.000 000 000 12 e-3
helion_proton_mass_ratio	2.99315267046	helion-proton mass ratio [] uncertainty=0.000 000 000 29
hertz_atomic_mass_unit_relationship	4.4398216616E-24	hertz-atomic mass unit relationship [u] uncertainty=0.000 000 0020 e-24
hertz_electron_volt_relationship	4.135667662E-15	hertz-electron volt relationship [eV] uncertainty=0.000 000 025 e-15
hertz_hartree_relationship	1.5198298460088E-16	hertz-hartree relationship [E_h] uncertainty=0.000 000 000 0090 e-16
hertz_inverse_meter_relationship	3.335640951E-9	hertz-inverse meter relationship [m^{-1}] uncertainty=(exact)
hertz_joule_relationship	6.626070040E-34	hertz-joule relationship [J] uncertainty=0.000 000 081 e-34
hertz_kelvin_relationship	4.7992447E-11	hertz-kelvin relationship [K] uncertainty=0.000 0028 e-11
hertz_kilogram_relationship	7.372497201E-51	hertz-kilogram relationship [kg] uncertainty=0.000 000 091 e-51
inverse_fine_structure_constant	137.035999139	inverse fine-structure constant [] uncertainty=0.000 000 031
inverse_meter_atomic_mass_unit_relationship	1.33102504900E-15	inverse meter-atomic mass unit relationship [u] uncertainty=0.000 000 000 61 e-15
inverse_meter_electron_volt_relationship	0.0000012398419739	inverse meter-electron volt relationship [eV] uncertainty=0.000 000 0076 e-6
inverse_meter_hartree_relationship	4.556335252767E-8	inverse meter-hartree relationship [E_h] uncertainty=0.000 000 000 027 e-8
inverse_meter_hertz_relationship	299792458	inverse meter-hertz relationship [Hz] uncertainty=(exact)
inverse_meter_joule_relationship	1.986445824E-25	inverse meter-joule relationship [J] uncertainty=0.000 000 024 e-25
inverse_meter_kelvin_relationship	0.0143877736	inverse meter-kelvin relationship [K] uncertainty=0.000 000 83 e-2
inverse_meter_kilogram_relationship	2.210219057E-42	inverse meter-kilogram relationship [kg] uncertainty=0.000 000 027 e-42
inverse_of_conductance_quantum	12906.4037278	inverse of conductance quantum [ohm] uncertainty=0.000 0029
Josephson_constant	4.835978525E+14	Josephson constant [Hz V^{-1}] uncertainty=0.0030 e9
joule_atomic_mass_unit_relationship	6700535363	joule-atomic mass unit relationship [u] uncertainty=0.000 000 082 e9
joule_electron_volt_relationship	6.241509126E+18	joule-electron volt relationship [eV] uncertainty=0.000 000 038 e18
joule_hartree_relationship	2.293712317E+17	joule-hartree relationship [E_h] uncertainty=0.000 000 028 e17
joule_hertz_relationship	1.509190205E+33	joule-hertz relationship [Hz] uncertainty=0.000 000 019 e33
joule_inverse_meter_relationship	5.034116651E+24	joule-inverse meter relationship [m^{-1}] uncertainty=0.000 000 062 e24
joule_kelvin_relationship	7.2429731E+22	joule-kelvin relationship [K] uncertainty=0.000 0042 e22
joule_kilogram_relationship	1.112650056E-17	joule-kilogram relationship [kg] uncertainty=(exact)
kelvin_atomic_mass_unit_relationship	9.2510842E-14	kelvin-atomic mass unit relationship [u] uncertainty=0.000 0053 e-14
kelvin_electron_volt_relationship	0.000086173303	kelvin-electron volt relationship [eV] uncertainty=0.000 0050 e-5
kelvin_hartree_relationship	0.0000031668105	kelvin-hartree relationship [E_h] uncertainty=0.000 0018 e-6
kelvin_hertz_relationship	2.0836612E+10	kelvin-hertz relationship [Hz] uncertainty=0.000 0012 e10
kelvin_inverse_meter_relationship	69.503457	kelvin-inverse meter relationship [m^{-1}] uncertainty=0.000 040
kelvin_joule_relationship	1.38064852E-23	kelvin-joule relationship [J] uncertainty=0.000 000 79 e-23
kelvin_kilogram_relationship	1.53617865E-40	kelvin-kilogram relationship [kg] uncertainty=0.000 000 88 e-40
kilogram_atomic_mass_unit_relationship	6.022140857E+26	kilogram-atomic mass unit relationship [u] uncertainty=0.000 000 074 e26
kilogram_electron_volt_relationship	5.609588650E+35	kilogram-electron volt relationship [eV] uncertainty=0.000 000 034 e35
kilogram_hartree_relationship	2.061485823E+34	kilogram-hartree relationship [E_h] uncertainty=0.000 000 025 e34
kilogram_hertz_relationship	1.356392512E+50	kilogram-hertz relationship [Hz] uncertainty=0.000 000 017 e50
kilogram_inverse_meter_relationship	4.524438411E+41	kilogram-inverse meter relationship [m^{-1}] uncertainty=0.000 000 056 e41
kilogram_joule_relationship	8.987551787E+16	kilogram-joule relationship [J] uncertainty=(exact)
kilogram_kelvin_relationship	6.5096595E+39	kilogram-kelvin relationship [K] uncertainty=0.000 0037 e39
lattice_parameter_of_silicon	5.431020504E-10	lattice parameter of silicon [m] uncertainty=0.000 0089 e-12
Loschmidt_constant_27315_K_100_kPa	2.6516467E+25	Loschmidt constant (273.15 K, 100 kPa) [m^{-3}] uncertainty=0.000 0015 e25
Loschmidt_constant_27315_K_101325_kPa	2.6867811E+25	Loschmidt constant (273.15 K, 101.325 kPa) [m^{-3}] uncertainty=0.000 0015 e25
mag_constant	0.0000012566370614	mag. constant [N A^{-2}] uncertainty=(exact)
mag_flux_quantum	2.067833831E-15	mag. flux quantum [Wb] uncertainty=0.000 000 013 e-15
molar_gas_constant	8.3144598	molar gas constant [J mol^{-1} K^{-1}] uncertainty=0.000 0048
molar_mass_constant	0.001	molar mass constant [kg mol^{-1}] uncertainty=(exact)
molar_mass_of_carbon_12	0.012	molar mass of carbon-12 [kg mol^{-1}] uncertainty=(exact)
molar_Planck_constant	3.9903127110E-10	molar Planck constant [J s mol^{-1}] uncertainty=0.000 000 0018 e-10
molar_Planck_constant_times_c	0.119626565582	molar Planck constant times c [J m mol^{-1}] uncertainty=0.000 000 000 054
molar_volume_of_ideal_gas_27315_K_100_kPa	0.022710947	molar volume of ideal gas (273.15 K, 100 kPa) [m^3 mol^{-1}] uncertainty=0.000 013 e-3
molar_volume_of_ideal_gas_27315_K_101325_kPa	0.022413962	molar volume of ideal gas (273.15 K, 101.325 kPa) [m^3 mol^{-1}] uncertainty=0.000 013 e-3
molar_volume_of_silicon	0.00001205883214	molar volume of silicon [m^3 mol^{-1}] uncertainty=0.000 000 61 e-6
Mo_x_unit	1.00209952E-13	Mo x unit [m] uncertainty=0.000 000 53 e-13
muon_Compton_wavelength	1.173444111E-14	muon Compton wavelength [m] uncertainty=0.000 000 26 e-15
muon_Compton_wavelength_over_2_pi	1.867594308E-15	muon Compton wavelength over 2 pi [m] uncertainty=0.000 000 042 e-15
muon_electron_mass_ratio	206.7682826	muon-electron mass ratio [] uncertainty=0.000 0046
muon_g_factor	-2.0023318418	muon g factor [] uncertainty=0.000 000 0013
muon_mag_mom	-4.49044826E-26	muon mag. mom. [J T^{-1}] uncertainty=0.000 000 10 e-26
muon_mag_mom_anomaly	0.00116592089	muon mag. mom. anomaly [] uncertainty=0.000 000 63 e-3
muon_mag_mom_to_Bohr_magneton_ratio	-0.00484197048	muon mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 11 e-3
muon_mag_mom_to_nuclear_magneton_ratio	-8.89059705	muon mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 20
muon_mass	1.883531594E-28	muon mass [kg] uncertainty=0.000 000 048 e-28
muon_mass_energy_equivalent	1.692833774E-11	muon mass energy equivalent [J] uncertainty=0.000 000 043 e-11
muon_mass_energy_equivalent_in_MeV	105.6583745	muon mass energy equivalent in MeV [MeV] uncertainty=0.000 0024
muon_mass_in_u	0.1134289257	muon mass in u [u] uncertainty=0.000 000 0025
muon_molar_mass	0.0001134289257	muon molar mass [kg mol^{-1}] uncertainty=0.000 000 0025 e-3
muon_neutron_mass_ratio	0.1124545167	muon-neutron mass ratio [] uncertainty=0.000 000 0025
muon_proton_mag_mom_ratio	-3.183345142	muon-proton mag. mom. ratio [] uncertainty=0.000 000 071
muon_proton_mass_ratio	0.1126095262	muon-proton mass ratio [] uncertainty=0.000 000 0025
muon_tau_mass_ratio	0.0594649	muon-tau mass ratio [] uncertainty=0.000 54 e-2
natural_unit_of_action	1.054571800E-34	natural unit of action [J s] uncertainty=0.000 000 013 e-34
natural_unit_of_action_in_eV_s	6.582119514E-16	natural unit of action in eV s [eV s] uncertainty=0.000 000 040 e-16
natural_unit_of_energy	8.18710565E-14	natural unit of energy [J] uncertainty=0.000 000 10 e-14
natural_unit_of_energy_in_MeV	0.5109989461	natural unit of energy in MeV [MeV] uncertainty=0.000 000 0031
natural_unit_of_length	3.8615926764E-13	natural unit of length [m] uncertainty=0.000 000 18 e-15
natural_unit_of_mass	9.10938356E-31	natural unit of mass [kg] uncertainty=0.000 000 11 e-31
natural_unit_of_momum	2.730924488E-22	natural unit of mom.um [kg m s^{-1}] uncertainty=0.000 000 034 e-22
natural_unit_of_momum_in_MeVpc	0.5109989461	natural unit of mom.um in MeV/c [MeV/c] uncertainty=0.000 000 0031
natural_unit_of_time	1.28808866712E-21	natural unit of time [s] uncertainty=0.000 000 000 58 e-21
natural_unit_of_velocity	299792458	natural unit of velocity [m s^{-1}] uncertainty=(exact)
neutron_Compton_wavelength	1.31959090481E-15	neutron Compton wavelength [m] uncertainty=0.000 000 000 88 e-15
neutron_Compton_wavelength_over_2_pi	2.1001941536E-16	neutron Compton wavelength over 2 pi [m] uncertainty=0.000 000 000 14 e-15
neutron_electron_mag_mom_ratio	0.00104066882	neutron-electron mag. mom. ratio [] uncertainty=0.000 000 25 e-3
neutron_electron_mass_ratio	1838.68366158	neutron-electron mass ratio [] uncertainty=0.000 000 90
neutron_g_factor	-3.82608545	neutron g factor [] uncertainty=0.000 000 90
neutron_gyromag_ratio	183247172	neutron gyromag. ratio [s^{-1} T^{-1}] uncertainty=0.000 000 43 e8
neutron_gyromag_ratio_over_2_pi	29.1646933	neutron gyromag. ratio over 2 pi [MHz T^{-1}] uncertainty=0.000 0069
neutron_mag_mom	-9.6623650E-27	neutron mag. mom. [J T^{-1}] uncertainty=0.000 000 23 e-26
neutron_mag_mom_to_Bohr_magneton_ratio	-0.00104187563	neutron mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 25 e-3
neutron_mag_mom_to_nuclear_magneton_ratio	-1.91304273	neutron mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 45
neutron_mass	1.674927471E-27	neutron mass [kg] uncertainty=0.000 000 021 e-27
neutron_mass_energy_equivalent	1.505349739E-10	neutron mass energy equivalent [J] uncertainty=0.000 000 019 e-10
neutron_mass_energy_equivalent_in_MeV	939.5654133	neutron mass energy equivalent in MeV [MeV] uncertainty=0.000 0058
neutron_mass_in_u	1.00866491588	neutron mass in u [u] uncertainty=0.000 000 000 49
neutron_molar_mass	0.00100866491588	neutron molar mass [kg mol^{-1}] uncertainty=0.000 000 000 49 e-3
neutron_muon_mass_ratio	8.89248408	neutron-muon mass ratio [] uncertainty=0.000 000 20
neutron_proton_mag_mom_ratio	-0.68497934	neutron-proton mag. mom. ratio [] uncertainty=0.000 000 16
neutron_proton_mass_difference	2.30557377E-30	neutron-proton mass difference [] uncertainty=0.000 000 85 e-30
neutron_proton_mass_difference_energy_equivalent	2.07214637E-13	neutron-proton mass difference energy equivalent [] uncertainty=0.000 000 76 e-13
neutron_proton_mass_difference_energy_equivalent_in_MeV	1.29333205	neutron-proton mass difference energy equivalent in MeV [] uncertainty=0.000 000 48
neutron_proton_mass_difference_in_u	0.00138844900	neutron-proton mass difference in u [] uncertainty=0.000 000 000 51
neutron_proton_mass_ratio	1.00137841898	neutron-proton mass ratio [] uncertainty=0.000 000 000 51
neutron_tau_mass_ratio	0.528790	neutron-tau mass ratio [] uncertainty=0.000 048
neutron_to_shielded_proton_mag_mom_ratio	-0.68499694	neutron to shielded proton mag. mom. ratio [] uncertainty=0.000 000 16
Newtonian_constant_of_gravitation	6.67408E-11	Newtonian constant of gravitation [m^3 kg^{-1} s^{-2}] uncertainty=0.000 31 e-11
Newtonian_constant_of_gravitation_over_h_bar_c	6.70861E-39	Newtonian constant of gravitation over h-bar c [(GeV/c^2)^-2] uncertainty=0.000 31 e-39
nuclear_magneton	5.050783699E-27	nuclear magneton [J T^{-1}] uncertainty=0.000 000 031 e-27
nuclear_magneton_in_eVpT	3.1524512550E-8	nuclear magneton in eV/T [eV T^{-1}] uncertainty=0.000 000 0015 e-8
nuclear_magneton_in_inverse_meters_per_tesla	0.02542623432	nuclear magneton in inverse meters per tesla [m^{-1} T^{-1}] uncertainty=0.000 000 016 e-2
nuclear_magneton_in_KpT	0.00036582690	nuclear magneton in K/T [K T^{-1}] uncertainty=0.000 0021 e-4
nuclear_magneton_in_MHzpT	7.622593285	nuclear magneton in MHz/T [MHz T^{-1}] uncertainty=0.000 000 047
Planck_constant	6.626070040E-34	Planck constant [J s] uncertainty=0.000 000 081 e-34
Planck_constant_in_eV_s	4.135667662E-15	Planck constant in eV s [eV s] uncertainty=0.000 000 025 e-15
Planck_constant_over_2_pi	1.054571800E-34	Planck constant over 2 pi [J s] uncertainty=0.000 000 013 e-34
Planck_constant_over_2_pi_in_eV_s	6.582119514E-16	Planck constant over 2 pi in eV s [eV s] uncertainty=0.000 000 040 e-16
Planck_constant_over_2_pi_times_c_in_MeV_fm	197.3269788	Planck constant over 2 pi times c in MeV fm [MeV fm] uncertainty=0.000 0012
Planck_length	1.616229E-35	Planck length [m] uncertainty=0.000 038 e-35
Planck_mass	2.176470E-8	Planck mass [kg] uncertainty=0.000 051 e-8
Planck_mass_energy_equivalent_in_GeV	1.220910E+19	Planck mass energy equivalent in GeV [GeV] uncertainty=0.000 029 e19
Planck_temperature	1.416808E+32	Planck temperature [K] uncertainty=0.000 033 e32
Planck_time	5.39116E-44	Planck time [s] uncertainty=0.000 13 e-44
proton_charge_to_mass_quotient	95788332.26	proton charge to mass quotient [C kg^{-1}] uncertainty=0.000 000 059 e7
proton_Compton_wavelength	1.32140985396E-15	proton Compton wavelength [m] uncertainty=0.000 000 000 61 e-15
proton_Compton_wavelength_over_2_pi	2.10308910109E-16	proton Compton wavelength over 2 pi [m] uncertainty=0.000 000 000 097 e-15
proton_electron_mass_ratio	1836.15267389	proton-electron mass ratio [] uncertainty=0.000 000 17
proton_g_factor	5.585694702	proton g factor [] uncertainty=0.000 000 017
proton_gyromag_ratio	267522190.0	proton gyromag. ratio [s^{-1} T^{-1}] uncertainty=0.000 000 018 e8
proton_gyromag_ratio_over_2_pi	42.57747892	proton gyromag. ratio over 2 pi [MHz T^{-1}] uncertainty=0.000 000 29
proton_mag_mom	1.4106067873E-26	proton mag. mom. [J T^{-1}] uncertainty=0.000 000 0097 e-26
proton_mag_mom_to_Bohr_magneton_ratio	0.0015210322053	proton mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 0046 e-3
proton_mag_mom_to_nuclear_magneton_ratio	2.7928473508	proton mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 0085
proton_mag_shielding_correction	0.000025691	proton mag. shielding correction [] uncertainty=0.011 e-6
proton_mass	1.672621898E-27	proton mass [kg] uncertainty=0.000 000 021 e-27
proton_mass_energy_equivalent	1.503277593E-10	proton mass energy equivalent [J] uncertainty=0.000 000 018 e-10
proton_mass_energy_equivalent_in_MeV	938.2720813	proton mass energy equivalent in MeV [MeV] uncertainty=0.000 0058
proton_mass_in_u	1.007276466879	proton mass in u [u] uncertainty=0.000 000 000 091
proton_molar_mass	0.001007276466879	proton molar mass [kg mol^{-1}] uncertainty=0.000 000 000 091 e-3
proton_muon_mass_ratio	8.88024338	proton-muon mass ratio [] uncertainty=0.000 000 20
proton_neutron_mag_mom_ratio	-1.45989805	proton-neutron mag. mom. ratio [] uncertainty=0.000 000 34
proton_neutron_mass_ratio	0.99862347844	proton-neutron mass ratio [] uncertainty=0.000 000 000 51
proton_rms_charge_radius	8.751E-16	proton rms charge radius [m] uncertainty=0.0061 e-15
proton_tau_mass_ratio	0.528063	proton-tau mass ratio [] uncertainty=0.000 048
quantum_of_circulation	0.00036369475486	quantum of circulation [m^2 s^{-1}] uncertainty=0.000 000 0017 e-4
quantum_of_circulation_times_2	0.00072738950972	quantum of circulation times 2 [m^2 s^{-1}] uncertainty=0.000 000 0033 e-4
Rydberg_constant	10973731.568508	Rydberg constant [m^{-1}] uncertainty=0.000 065
Rydberg_constant_times_c_in_Hz	3.289841960355E+15	Rydberg constant times c in Hz [Hz] uncertainty=0.000 000 000 019 e15
Rydberg_constant_times_hc_in_eV	13.605693009	Rydberg constant times hc in eV [eV] uncertainty=0.000 000 084
Rydberg_constant_times_hc_in_J	2.179872325E-18	Rydberg constant times hc in J [J] uncertainty=0.000 000 027 e-18
Sackur_Tetrode_constant_1_K_100_kPa	-1.1517084	Sackur-Tetrode constant (1 K, 100 kPa) [] uncertainty=0.000 0014
Sackur_Tetrode_constant_1_K_101325_kPa	-1.1648714	Sackur-Tetrode constant (1 K, 101.325 kPa) [] uncertainty=0.000 0014
second_radiation_constant	0.0143877736	second radiation constant [m K] uncertainty=0.000 000 83 e-2
shielded_helion_gyromag_ratio	203789458.5	shielded helion gyromag. ratio [s^{-1} T^{-1}] uncertainty=0.000 000 027 e8
shielded_helion_gyromag_ratio_over_2_pi	32.43409966	shielded helion gyromag. ratio over 2 pi [MHz T^{-1}] uncertainty=0.000 000 43
shielded_helion_mag_mom	-1.074553080E-26	shielded helion mag. mom. [J T^{-1}] uncertainty=0.000 000 014 e-26
shielded_helion_mag_mom_to_Bohr_magneton_ratio	-0.001158671471	shielded helion mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 014 e-3
shielded_helion_mag_mom_to_nuclear_magneton_ratio	-2.127497720	shielded helion mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 025
shielded_helion_to_proton_mag_mom_ratio	-0.7617665603	shielded helion to proton mag. mom. ratio [] uncertainty=0.000 000 0092
shielded_helion_to_shielded_proton_mag_mom_ratio	-0.7617861313	shielded helion to shielded proton mag. mom. ratio [] uncertainty=0.000 000 0033
shielded_proton_gyromag_ratio	267515317.1	shielded proton gyromag. ratio [s^{-1} T^{-1}] uncertainty=0.000 000 033 e8
shielded_proton_gyromag_ratio_over_2_pi	42.57638507	shielded proton gyromag. ratio over 2 pi [MHz T^{-1}] uncertainty=0.000 000 53
shielded_proton_mag_mom	1.410570547E-26	shielded proton mag. mom. [J T^{-1}] uncertainty=0.000 000 018 e-26
shielded_proton_mag_mom_to_Bohr_magneton_ratio	0.001520993128	shielded proton mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 017 e-3
shielded_proton_mag_mom_to_nuclear_magneton_ratio	2.792775600	shielded proton mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 030
speed_of_light_in_vacuum	299792458	speed of light in vacuum [m s^{-1}] uncertainty=(exact)
standard_acceleration_of_gravity	9.80665	standard acceleration of gravity [m s^{-2}] uncertainty=(exact)
standard_atmosphere	101325	standard atmosphere [Pa] uncertainty=(exact)
standard_state_pressure	100000	standard-state pressure [Pa] uncertainty=(exact)
Stefan_Boltzmann_constant	5.670367E-8	Stefan-Boltzmann constant [W m^{-2} K^{-4}] uncertainty=0.000 013 e-8
tau_Compton_wavelength	6.97787E-16	tau Compton wavelength [m] uncertainty=0.000 063 e-15
tau_Compton_wavelength_over_2_pi	1.11056E-16	tau Compton wavelength over 2 pi [m] uncertainty=0.000 010 e-15
tau_electron_mass_ratio	3477.15	tau-electron mass ratio [] uncertainty=0.31
tau_mass	3.16747E-27	tau mass [kg] uncertainty=0.000 29 e-27
tau_mass_energy_equivalent	2.84678E-10	tau mass energy equivalent [J] uncertainty=0.000 26 e-10
tau_mass_energy_equivalent_in_MeV	1776.82	tau mass energy equivalent in MeV [MeV] uncertainty=0.16
tau_mass_in_u	1.90749	tau mass in u [u] uncertainty=0.000 17
tau_molar_mass	0.00190749	tau molar mass [kg mol^{-1}] uncertainty=0.000 17 e-3
tau_muon_mass_ratio	16.8167	tau-muon mass ratio [] uncertainty=0.0015
tau_neutron_mass_ratio	1.89111	tau-neutron mass ratio [] uncertainty=0.000 17
tau_proton_mass_ratio	1.89372	tau-proton mass ratio [] uncertainty=0.000 17
Thomson_cross_section	6.6524587158E-29	Thomson cross section [m^2] uncertainty=0.000 000 000 91 e-28
triton_electron_mass_ratio	5496.92153588	triton-electron mass ratio [] uncertainty=0.000 000 26
triton_g_factor	5.957924920	triton g factor [] uncertainty=0.000 000 028
triton_mag_mom	1.504609503E-26	triton mag. mom. [J T^{-1}] uncertainty=0.000 000 012 e-26
triton_mag_mom_to_Bohr_magneton_ratio	0.0016223936616	triton mag. mom. to Bohr magneton ratio [] uncertainty=0.000 000 0076 e-3
triton_mag_mom_to_nuclear_magneton_ratio	2.978962460	triton mag. mom. to nuclear magneton ratio [] uncertainty=0.000 000 014
triton_mass	5.007356665E-27	triton mass [kg] uncertainty=0.000 000 062 e-27
triton_mass_energy_equivalent	4.500387735E-10	triton mass energy equivalent [J] uncertainty=0.000 000 055 e-10
triton_mass_energy_equivalent_in_MeV	2808.921112	triton mass energy equivalent in MeV [MeV] uncertainty=0.000 017
triton_mass_in_u	3.01550071632	triton mass in u [u] uncertainty=0.000 000 000 11
triton_molar_mass	0.00301550071632	triton molar mass [kg mol^{-1}] uncertainty=0.000 000 000 11 e-3
triton_proton_mass_ratio	2.99371703348	triton-proton mass ratio [] uncertainty=0.000 000 000 22
unified_atomic_mass_unit	1.660539040E-27	unified atomic mass unit [kg] uncertainty=0.000 000 020 e-27
von_Klitzing_constant	25812.8074555	von Klitzing constant [ohm] uncertainty=0.000 0059
weak_mixing_angle	0.2223	weak mixing angle [] uncertainty=0.0021
Wien_frequency_displacement_law_constant	5.8789238E+10	Wien frequency displacement law constant [Hz K^{-1}] uncertainty=0.000 0034 e10
Wien_wavelength_displacement_law_constant	0.0028977729	Wien wavelength displacement law constant [m K] uncertainty=0.000 0017 e-3
calorie_joule_relationship	4.184	calorie-joule relationship [J] uncertainty=(exact)
h	6.626070040E-34	h [J] The Planck constant (Js)
c	299792458	c [Hz] Speed of light (ms$^{-1}$)
kb	1.38064852E-23	kb [J] The Boltzmann constant (JK$^{-1}$)
R	8.3144598	R [J mol^-1 K^-1] Universal gas constant (JK$^{-1}$mol$^{-1}$)
bohr2angstroms	0.52917721067	bohr2angstroms [AA] Bohr to Angstroms conversion factor
bohr2m	5.2917721067E-11	bohr2m [m] Bohr to meters conversion factor
bohr2cm	5.291772106700E-9	bohr2cm [cm] Bohr to centimeters conversion factor
amu2g	1.660539040000E-24	amu2g [g] Atomic mass units to grams conversion factor
amu2kg	1.660539040E-27	amu2kg [kg] Atomic mass units to kg conversion factor
au2amu	0.000548579909070	au2amu [u] Atomic units (m$@@e$) to atomic mass units conversion factor
hartree2J	4.359744650E-18	hartree2J [J] Hartree to joule conversion factor
hartree2aJ	4.359744650	hartree2aJ [aJ] Hartree to attojoule (10$^{-18}$J) conversion factor
cal2J	4.184	cal2J [J] Calorie to joule conversion factor
dipmom_au2si	8.478353552E-30	dipmom_au2si [C m] Atomic units to SI units (Cm) conversion factor for dipoles
dipmom_au2debye	2.541746451895025916414946904	dipmom_au2debye [???] Atomic units to Debye conversion factor for dipoles
dipmom_debye2si	3.335640951E-30	dipmom_debye2si [???] Debye to SI units (Cm) conversion factor for dipoles
c_au	137.035999139	c_au [] Speed of light in atomic units
hartree2ev	27.21138602	hartree2ev [eV] Hartree to eV conversion factor
hartree2wavenumbers	219474.6313702	hartree2wavenumbers [cm^-1] Hartree to cm$^{-1}$ conversion factor
hartree2kcalmol	627.5094737775374055927342256	hartree2kcalmol [kcal mol^-1] Hartree to kcal mol$^{-1}$ conversion factor
hartree2kJmol	2625.4996382852165050	hartree2kJmol [kJ mol^-1] Hartree to kilojoule mol$^{-1}$ conversion factor
hartree2MHz	6579683920.711	hartree2MHz [MHz] Hartree to MHz conversion factor
kcalmol2wavenumbers	349.7550882318031839256652313	kcalmol2wavenumbers [kcal cm mol^-1] kcal mol$^{-1}$ to cm$^{-1}$ conversion factor
e0	8.854187817E-12	e0 [F m^-1] Vacuum permittivity (Fm$^{-1}$)
na	6.022140857E+23	na [mol^-1] Avogadro’s number
me	9.10938356E-31	me [kg] Electron rest mass (in kg)