Constants (scipy.constants) — SciPy v1.15.2 Manual (original) (raw)

In addition to the above variables, scipy.constants also contains the 2022 CODATA recommended values [CODATA2022] database containing more physical constants.

alpha particle mass

6.644657345e-27 kg

alpha particle mass energy equivalent

5.9719201997e-10 J

alpha particle mass energy equivalent in MeV

3727.3794118 MeV

alpha particle mass in u

4.001506179129 u

alpha particle molar mass

0.0040015061833 kg mol^-1

alpha particle relative atomic mass

4.001506179129

alpha particle rms charge radius

1.6785e-15 m

alpha particle-electron mass ratio

7294.29954171

alpha particle-proton mass ratio

3.972599690252

Angstrom star

1.00001495e-10 m

atomic mass constant

1.66053906892e-27 kg

atomic mass constant energy equivalent

1.49241808768e-10 J

atomic mass constant energy equivalent in MeV

931.49410372 MeV

atomic mass unit-electron volt relationship

931494103.72 eV

atomic mass unit-hartree relationship

34231776.922 E_h

atomic mass unit-hertz relationship

2.25234272185e+23 Hz

atomic mass unit-inverse meter relationship

751300662090000.0 m^-1

atomic mass unit-joule relationship

1.49241808768e-10 J

atomic mass unit-kelvin relationship

10809540206700.0 K

atomic mass unit-kilogram relationship

1.66053906892e-27 kg

atomic unit of 1st hyperpolarizability

3.2063612996e-53 C^3 m^3 J^-2

atomic unit of 2nd hyperpolarizability

6.2353799735e-65 C^4 m^4 J^-3

atomic unit of action

1.0545718176461565e-34 J s

atomic unit of charge

1.602176634e-19 C

atomic unit of charge density

1081202386770.0 C m^-3

atomic unit of current

0.0066236182375082 A

atomic unit of electric dipole mom.

8.4783536198e-30 C m

atomic unit of electric field

514220675112.0 V m^-1

atomic unit of electric field gradient

9.7173624424e+21 V m^-2

atomic unit of electric polarizability

1.64877727212e-41 C^2 m^2 J^-1

atomic unit of electric potential

27.211386245981 V

atomic unit of electric quadrupole mom.

4.4865515185e-40 C m^2

atomic unit of energy

4.359744722206e-18 J

atomic unit of force

8.2387235038e-08 N

atomic unit of length

5.29177210544e-11 m

atomic unit of mag. dipole mom.

1.85480201315e-23 J T^-1

atomic unit of mag. flux density

235051.757077 T

atomic unit of magnetizability

7.8910365794e-29 J T^-2

atomic unit of mass

9.1093837139e-31 kg

atomic unit of momentum

1.99285191545e-24 kg m s^-1

atomic unit of permittivity

1.1126500562e-10 F m^-1

atomic unit of time

2.4188843265864e-17 s

atomic unit of velocity

2187691.26216 m s^-1

Avogadro constant

6.02214076e+23 mol^-1

Bohr magneton

9.2740100657e-24 J T^-1

Bohr magneton in eV/T

5.7883817982e-05 eV T^-1

Bohr magneton in Hz/T

13996244917.1 Hz T^-1

Bohr magneton in inverse meter per tesla

46.686447719 m^-1 T^-1

Bohr magneton in K/T

0.67171381472 K T^-1

Bohr radius

5.29177210544e-11 m

Boltzmann constant

1.380649e-23 J K^-1

Boltzmann constant in eV/K

8.617333262145179e-05 eV K^-1

Boltzmann constant in Hz/K

20836619123.327576 Hz K^-1

Boltzmann constant in inverse meter per kelvin

69.50348004861274 m^-1 K^-1

characteristic impedance of vacuum

376.730313412 ohm

classical electron radius

2.8179403205e-15 m

Compton wavelength

2.42631023538e-12 m

conductance quantum

7.748091729863649e-05 S

conventional value of ampere-90

1.0000000888714378 A

conventional value of coulomb-90

1.0000000888714378 C

conventional value of farad-90

0.9999999822063325 F

conventional value of henry-90

1.0000000177936679 H

conventional value of Josephson constant

483597900000000.0 Hz V^-1

conventional value of ohm-90

1.0000000177936679 ohm

conventional value of volt-90

1.0000001066651072 V

conventional value of von Klitzing constant

25812.807 ohm

conventional value of watt-90

1.0000001955365543 W

Copper x unit

1.00207697e-13 m

deuteron g factor

0.8574382335

deuteron mag. mom.

4.330735087e-27 J T^-1

deuteron mag. mom. to Bohr magneton ratio

0.0004669754568

deuteron mag. mom. to nuclear magneton ratio

0.8574382335

deuteron mass

3.3435837768e-27 kg

deuteron mass energy equivalent

3.00506323491e-10 J

deuteron mass energy equivalent in MeV

1875.612945 MeV

deuteron mass in u

2.013553212544 u

deuteron molar mass

0.00201355321466 kg mol^-1

deuteron relative atomic mass

2.013553212544

deuteron rms charge radius

2.12778e-15 m

deuteron-electron mag. mom. ratio

-0.000466434555

deuteron-electron mass ratio

3670.482967655

deuteron-neutron mag. mom. ratio

-0.44820652

deuteron-proton mag. mom. ratio

0.3070122093

deuteron-proton mass ratio

1.9990075012699

electron charge to mass quotient

-175882000838.0 C kg^-1

electron g factor

-2.00231930436092

electron gyromag. ratio

176085962784.0 s^-1 T^-1

electron gyromag. ratio in MHz/T

28024.9513861 MHz T^-1

electron mag. mom.

-9.2847646917e-24 J T^-1

electron mag. mom. anomaly

0.00115965218046

electron mag. mom. to Bohr magneton ratio

-1.00115965218046

electron mag. mom. to nuclear magneton ratio

-1838.281971877

electron mass

9.1093837139e-31 kg

electron mass energy equivalent

8.187105788e-14 J

electron mass energy equivalent in MeV

0.51099895069 MeV

electron mass in u

0.0005485799090441 u

electron molar mass

5.4857990962e-07 kg mol^-1

electron relative atomic mass

0.0005485799090441

electron to alpha particle mass ratio

0.0001370933554733

electron to shielded helion mag. mom. ratio

864.05823986

electron to shielded proton mag. mom. ratio

-658.2275856

electron volt

1.602176634e-19 J

electron volt-atomic mass unit relationship

1.07354410083e-09 u

electron volt-hartree relationship

0.036749322175665 E_h

electron volt-hertz relationship

241798924208491.8 Hz

electron volt-inverse meter relationship

806554.3937349211 m^-1

electron volt-joule relationship

1.602176634e-19 J

electron volt-kelvin relationship

11604.518121550082 K

electron volt-kilogram relationship

1.7826619216278975e-36 kg

electron-deuteron mag. mom. ratio

-2143.9234921

electron-deuteron mass ratio

0.0002724437107629

electron-helion mass ratio

0.0001819543074649

electron-muon mag. mom. ratio

206.7669881

electron-muon mass ratio

0.0048363317

electron-neutron mag. mom. ratio

960.92048

electron-neutron mass ratio

0.00054386734416

electron-proton mag. mom. ratio

-658.21068789

electron-proton mass ratio

0.0005446170214889

electron-tau mass ratio

0.000287585

electron-triton mass ratio

0.0001819200062327

elementary charge

1.602176634e-19 C

elementary charge over h-bar

1519267447878626.0 A J^-1

Faraday constant

96485.33212331001 C mol^-1

Fermi coupling constant

1.1663787e-05 GeV^-2

fine-structure constant

0.0072973525643

first radiation constant

3.7417718521927573e-16 W m^2

first radiation constant for spectral radiance

1.1910429723971884e-16 W m^2 sr^-1

Hartree energy

4.359744722206e-18 J

Hartree energy in eV

27.211386245981 eV

hartree-atomic mass unit relationship

2.92126231797e-08 u

hartree-electron volt relationship

27.211386245981 eV

hartree-hertz relationship

6579683920499900.0 Hz

hartree-inverse meter relationship

21947463.136314 m^-1

hartree-joule relationship

4.359744722206e-18 J

hartree-kelvin relationship

315775.02480398 K

hartree-kilogram relationship

4.8508702095419e-35 kg

helion g factor

-4.2552506995

helion mag. mom.

-1.07461755198e-26 J T^-1

helion mag. mom. to Bohr magneton ratio

-0.00115874098083

helion mag. mom. to nuclear magneton ratio

-2.1276253498

helion mass

5.0064127862e-27 kg

helion mass energy equivalent

4.4995394185e-10 J

helion mass energy equivalent in MeV

2808.39161112 MeV

helion mass in u

3.014932246932 u

helion molar mass

0.0030149322501 kg mol^-1

helion relative atomic mass

3.014932246932

helion shielding shift

5.9967029e-05

helion-electron mass ratio

5495.88527984

helion-proton mass ratio

2.993152671552

hertz-atomic mass unit relationship

4.439821659e-24 u

hertz-electron volt relationship

4.135667696923859e-15 eV

hertz-hartree relationship

1.5198298460574e-16 E_h

hertz-inverse meter relationship

3.3356409519815204e-09 m^-1

hertz-joule relationship

6.62607015e-34 J

hertz-kelvin relationship

4.799243073366221e-11 K

hertz-kilogram relationship

7.372497323812708e-51 kg

hyperfine transition frequency of Cs-133

9192631770.0 Hz

inverse fine-structure constant

137.035999177

inverse meter-atomic mass unit relationship

1.33102504824e-15 u

inverse meter-electron volt relationship

1.2398419843320026e-06 eV

inverse meter-hartree relationship

4.5563352529132e-08 E_h

inverse meter-hertz relationship

299792458.0 Hz

inverse meter-joule relationship

1.9864458571489286e-25 J

inverse meter-kelvin relationship

0.014387768775039337 K

inverse meter-kilogram relationship

2.2102190943042335e-42 kg

inverse of conductance quantum

12906.403729652257 ohm

Josephson constant

483597848416983.6 Hz V^-1

joule-atomic mass unit relationship

6700535247.1 u

joule-electron volt relationship

6.241509074460763e+18 eV

joule-hartree relationship

2.2937122783969e+17 E_h

joule-hertz relationship

1.5091901796421518e+33 Hz

joule-inverse meter relationship

5.03411656754271e+24 m^-1

joule-kelvin relationship

7.24297051603992e+22 K

joule-kilogram relationship

1.1126500560536185e-17 kg

kelvin-atomic mass unit relationship

9.2510872884e-14 u

kelvin-electron volt relationship

8.617333262145179e-05 eV

kelvin-hartree relationship

3.1668115634564e-06 E_h

kelvin-hertz relationship

20836619123.327576 Hz

kelvin-inverse meter relationship

69.50348004861274 m^-1

kelvin-joule relationship

1.380649e-23 J

kelvin-kilogram relationship

1.5361791872403723e-40 kg

kilogram-atomic mass unit relationship

6.0221407537e+26 u

kilogram-electron volt relationship

5.609588603804452e+35 eV

kilogram-hartree relationship

2.0614857887415e+34 E_h

kilogram-hertz relationship

1.3563924896521321e+50 Hz

kilogram-inverse meter relationship

4.524438335443823e+41 m^-1

kilogram-joule relationship

8.987551787368176e+16 J

kilogram-kelvin relationship

6.509657260728958e+39 K

lattice parameter of silicon

5.431020511e-10 m

lattice spacing of ideal Si (220)

1.920155716e-10 m

Loschmidt constant (273.15 K, 100 kPa)

2.6516458048837345e+25 m^-3

Loschmidt constant (273.15 K, 101.325 kPa)

2.686780111798444e+25 m^-3

luminous efficacy

683.0 lm W^-1

mag. flux quantum

2.0678338484619295e-15 Wb

molar gas constant

8.31446261815324 J mol^-1 K^-1

molar mass constant

0.00100000000105 kg mol^-1

molar mass of carbon-12

0.0120000000126 kg mol^-1

molar Planck constant

3.990312712893431e-10 J Hz^-1 mol^-1

molar volume of ideal gas (273.15 K, 100 kPa)

0.02271095464148557 m^3 mol^-1

molar volume of ideal gas (273.15 K, 101.325 kPa)

0.022413969545014137 m^3 mol^-1

molar volume of silicon

1.205883199e-05 m^3 mol^-1

Molybdenum x unit

1.00209952e-13 m

muon Compton wavelength

1.17344411e-14 m

muon g factor

-2.00233184123

muon mag. mom.

-4.4904483e-26 J T^-1

muon mag. mom. anomaly

0.00116592062

muon mag. mom. to Bohr magneton ratio

-0.00484197048

muon mag. mom. to nuclear magneton ratio

-8.89059704

muon mass

1.883531627e-28 kg

muon mass energy equivalent

1.692833804e-11 J

muon mass energy equivalent in MeV

105.6583755 MeV

muon mass in u

0.1134289257 u

muon molar mass

0.0001134289258 kg mol^-1

muon-electron mass ratio

206.7682827

muon-neutron mass ratio

0.1124545168

muon-proton mag. mom. ratio

-3.183345146

muon-proton mass ratio

0.1126095262

muon-tau mass ratio

0.0594635

natural unit of action

1.0545718176461565e-34 J s

natural unit of action in eV s

6.582119569509067e-16 eV s

natural unit of energy

8.187105788e-14 J

natural unit of energy in MeV

0.51099895069 MeV

natural unit of length

3.8615926744e-13 m

natural unit of mass

9.1093837139e-31 kg

natural unit of momentum

2.730924488e-22 kg m s^-1

natural unit of momentum in MeV/c

0.5109989461 MeV/c

natural unit of time

1.28808866644e-21 s

natural unit of velocity

299792458.0 m s^-1

neutron Compton wavelength

1.31959090382e-15 m

neutron g factor

-3.82608552

neutron gyromag. ratio

183247174.0 s^-1 T^-1

neutron gyromag. ratio in MHz/T

29.1646935 MHz T^-1

neutron mag. mom.

-9.6623653e-27 J T^-1

neutron mag. mom. to Bohr magneton ratio

-0.00104187565

neutron mag. mom. to nuclear magneton ratio

-1.91304276

neutron mass

1.67492750056e-27 kg

neutron mass energy equivalent

1.50534976514e-10 J

neutron mass energy equivalent in MeV

939.56542194 MeV

neutron mass in u

1.00866491606 u

neutron molar mass

0.00100866491712 kg mol^-1

neutron relative atomic mass

1.00866491606

neutron to shielded proton mag. mom. ratio

-0.68499694

neutron-electron mag. mom. ratio

0.00104066884

neutron-electron mass ratio

1838.683662

neutron-muon mass ratio

8.89248408

neutron-proton mag. mom. ratio

-0.68497935

neutron-proton mass difference

2.30557461e-30 kg

neutron-proton mass difference energy equivalent

2.07214712e-13 J

neutron-proton mass difference energy equivalent in MeV

1.29333251 MeV

neutron-proton mass difference in u

0.00138844948 u

neutron-proton mass ratio

1.00137841946

neutron-tau mass ratio

0.528779

Newtonian constant of gravitation

6.6743e-11 m^3 kg^-1 s^-2

Newtonian constant of gravitation over h-bar c

6.70883e-39 (GeV/c^2)^-2

nuclear magneton

5.0507837393e-27 J T^-1

nuclear magneton in eV/T

3.15245125417e-08 eV T^-1

nuclear magneton in inverse meter per tesla

0.0254262341009 m^-1 T^-1

nuclear magneton in K/T

0.00036582677706 K T^-1

nuclear magneton in MHz/T

7.6225932188 MHz T^-1

Planck constant

6.62607015e-34 J Hz^-1

Planck constant in eV/Hz

4.135667696923859e-15 eV Hz^-1

Planck length

1.616255e-35 m

Planck mass

2.176434e-08 kg

Planck mass energy equivalent in GeV

1.22089e+19 GeV

Planck temperature

1.416784e+32 K

Planck time

5.391247e-44 s

proton charge to mass quotient

95788331.43 C kg^-1

proton Compton wavelength

1.3214098536e-15 m

proton g factor

5.5856946893

proton gyromag. ratio

267522187.08 s^-1 T^-1

proton gyromag. ratio in MHz/T

42.577478461 MHz T^-1

proton mag. mom.

1.41060679545e-26 J T^-1

proton mag. mom. to Bohr magneton ratio

0.0015210322023

proton mag. mom. to nuclear magneton ratio

2.79284734463

proton mag. shielding correction

2.56715e-05

proton mass

1.67262192595e-27 kg

proton mass energy equivalent

1.50327761802e-10 J

proton mass energy equivalent in MeV

938.27208943 MeV

proton mass in u

1.0072764665789 u

proton molar mass

0.00100727646764 kg mol^-1

proton relative atomic mass

1.0072764665789

proton rms charge radius

8.4075e-16 m

proton-electron mass ratio

1836.152673426

proton-muon mass ratio

8.88024338

proton-neutron mag. mom. ratio

-1.45989802

proton-neutron mass ratio

0.99862347797

proton-tau mass ratio

0.528051

quantum of circulation

0.00036369475467 m^2 s^-1

quantum of circulation times 2

0.00072738950934 m^2 s^-1

reduced Compton wavelength

3.8615926744e-13 m

reduced muon Compton wavelength

1.867594306e-15 m

reduced neutron Compton wavelength

2.100194152e-16 m

reduced Planck constant

1.0545718176461565e-34 J s

reduced Planck constant in eV s

6.582119569509067e-16 eV s

reduced Planck constant times c in MeV fm

197.3269804593025 MeV fm

reduced proton Compton wavelength

2.10308910051e-16 m

reduced tau Compton wavelength

1.110538e-16 m

Rydberg constant

10973731.568157 m^-1

Rydberg constant times c in Hz

3289841960250000.0 Hz

Rydberg constant times hc in eV

13.60569312299 eV

Rydberg constant times hc in J

2.179872361103e-18 J

Sackur-Tetrode constant (1 K, 100 kPa)

-1.15170753496

Sackur-Tetrode constant (1 K, 101.325 kPa)

-1.16487052149

second radiation constant

0.014387768775039337 m K

shielded helion gyromag. ratio

203789460.78 s^-1 T^-1

shielded helion gyromag. ratio in MHz/T

32.434100033 MHz T^-1

shielded helion mag. mom.

-1.07455311035e-26 J T^-1

shielded helion mag. mom. to Bohr magneton ratio

-0.00115867149457

shielded helion mag. mom. to nuclear magneton ratio

-2.1274977624

shielded helion to proton mag. mom. ratio

-0.76176657721

shielded helion to shielded proton mag. mom. ratio

-0.7617861334

shielded proton gyromag. ratio

267515319.4 s^-1 T^-1

shielded proton gyromag. ratio in MHz/T

42.57638543 MHz T^-1

shielded proton mag. mom.

1.410570583e-26 J T^-1

shielded proton mag. mom. to Bohr magneton ratio

0.0015209931551

shielded proton mag. mom. to nuclear magneton ratio

2.792775648

shielding difference of d and p in HD

1.9877e-08

shielding difference of t and p in HT

2.3945e-08

speed of light in vacuum

299792458.0 m s^-1

standard acceleration of gravity

9.80665 m s^-2

standard atmosphere

101325.0 Pa

standard-state pressure

100000.0 Pa

Stefan-Boltzmann constant

5.6703744191844314e-08 W m^-2 K^-4

tau Compton wavelength

6.97771e-16 m

tau energy equivalent

1776.86 MeV

tau mass

3.16754e-27 kg

tau mass energy equivalent

2.84684e-10 J

tau mass in u

1.90754 u

tau molar mass

0.00190754 kg mol^-1

tau-electron mass ratio

3477.23

tau-muon mass ratio

16.817

tau-neutron mass ratio

1.89115

tau-proton mass ratio

1.89376

Thomson cross section

6.6524587051e-29 m^2

triton g factor

5.95792493

triton mag. mom.

1.5046095178e-26 J T^-1

triton mag. mom. to Bohr magneton ratio

0.0016223936648

triton mag. mom. to nuclear magneton ratio

2.978962465

triton mass

5.0073567512e-27 kg

triton mass energy equivalent

4.5003878119e-10 J

triton mass energy equivalent in MeV

2808.92113668 MeV

triton mass in u

3.01550071597 u

triton molar mass

0.00301550071913 kg mol^-1

triton relative atomic mass

3.01550071597

triton to proton mag. mom. ratio

1.0666399189

triton-electron mass ratio

5496.92153551

triton-proton mass ratio

2.99371703403

unified atomic mass unit

1.66053906892e-27 kg

vacuum electric permittivity

8.8541878188e-12 F m^-1

vacuum mag. permeability

1.25663706127e-06 N A^-2

von Klitzing constant

25812.807459304513 ohm

W to Z mass ratio

0.88145

weak mixing angle

0.22305

Wien frequency displacement law constant

58789257576.468254 Hz K^-1

Wien wavelength displacement law constant

0.0028977719551851727 m K