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Circular constant π
pi = 3.1415926535898 Euler’s number e
E = 2.718281828459 SI prefixes
kilo, nano, … Standard gravity g
g = 9.80665 m/s2 Avogadro constant NA
Na = 6.0221415⋅1023 mol-1 Loschmidt constant n0
n0 = 2.6867773⋅1025 m-3 Atomic mass u
u = 1.66053886⋅10-27 kg Rest masses of elementary particles
me, mp, mn, etc. Boltzmann constant k
kB = 1.3806505⋅10-23 J/K Universal gas constant R
R = 8.314472 J⋅mol-1⋅K-1 Molar gas volume Vm
Vm = 22.413996 l/mol Standard atmosphere p0
p0 = 101 325 Pa Gravitational constant G
G = 6.674⋅10-11 m3⋅kg-1⋅s-2 Vacuum speed of light c
c = 299 792 458 m/s Elementary charge e
el = 1.60217653⋅10-19 C Electric constant ε0
eps = 8.854⋅10-12 F/m Magnetic constant μ0
m0 = 12.566⋅10-7 N⋅A-2 Faraday constant F
F = 96 485.3383 C/mol Wien’s displacement constant b
b = 2.8977685⋅10-3 m⋅K Stefan-Boltzmann constant σ
sb = 5.6704⋅10-8 W⋅m-2⋅K-4 Planck constant h
h = 6.6260693⋅10-34 Js Reduced Planck constant ħ
hp = h/2π = 1.05457⋅10-34 Js Rydberg constant R∞
ryd = 1.09737⋅107 m-1 Rydberg frequency R
Rf = c⋅R∞ = 3.2898⋅1015 Hz Rydberg energy Ry
Ry = h⋅c⋅R∞ = 13.6057 eV Bohr radius a0
a0 = 0.5291772108⋅10-10 m Bohr magneton μB
mB = 9.27400949⋅10-24 J/T Nuclear magneton μN
mN = 5.05078343⋅10-27 J/T Compton wavelength (electron) λC,e
Ce = 2.426310238⋅10-12 m Compton wavelength (neutron) λC,n
Cn = 1.3195909067⋅10-15 m Compton wavelength (proton) λC,p
Cp = 1.3214098555⋅10-15 m Classical electron radius re
re = 2.817940325⋅10-15 m Fine-structure constant α
fine = 7.297352568⋅10-3 Fluxon Φ0
flux = 2.06783372⋅10-15 Wb Josephson constant KJ
Kj = 1/Φ0 = 483.598⋅1012 Hz/V Landé g-factor of the electron ge
ge = 2.0023193043718 Gyromagnetic ratio γProton
gyro = 2.675⋅108 rad⋅s-1⋅T-1 Quantum Hall resistance RK
Rk = 25.812807449⋅103 Ω
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Elementary charge e

Syntax: el

e = 1.60217653⋅10-19 C

Elementary charge