• Light Speed in vacuum (c)
    3 × 108 m/s
  • Sound Speed in air (v)
    343.2 m/s
  • Permittivity constant (ε0)
    8.854 × 10−12 F/m
  • Permeability constant (μ0)
    1.257 × 10−6 H/m
  • Avogadro's Number (NA)
    6.022 × 1023 mol-1
  • Universal Gas constant (R)
    8.3145 J/mol·K
  • Atomic Mass Unit (1 u)
    1.6605 × 10−27 kg
  • Rest Energy of Electron
    0.5109 MeV
  • Electron Charge (e-)
    − 1.602 × 10−19 C
  • Photon Charge (p+)
    + 1.602 × 10−19 C
  • Neutron Charge (n)
    0 C
  • Electron mass (me)
    9.1091 × 10−31 kg
  • Proton mass (mp)
    1.6725 × 10−27 kg
  • Neutron mass (mn)
    1.6750 × 10−27 kg
  • Pi (π)
    3.14159 ≈ 22/7
  • Euler's number (e)
    2.71828
  • Coulomb constant (ke)
    9 × 109 N·m2/C2
  • Faraday constant (F)
    9.6485 × 104 C/mol
  • Planck's constant (h)
    6.6261 × 10−34 J·s
  • Boltzmann constant (k)
    1.3806 × 10−23 J/K
  • Stefan-Boltzmann constant (σ)
    5.6704 × 10−8 W/m2·K4
  • Rydberg constant (R)
    1.097 × 10−7 m-1
  • Bohr radius (a0)
    5.29 × 10−11 m
  • Gravitational acceleration (g)
    9.81 m/s2
  • Gravitational constant (G)
    6.6742 × 10−11 N·m2/kg2
  • Atmospheric pressure (1 atm)
    1.01325 × 105 Pa
  • Earth mass (ME)
    5.9722 × 1024 kg
  • Earth radius (RE)
    6371 km