9.8 ms^⁻² Acceleration of free fall

6.67×10^⁻¹¹ Nm^²kg^⁻² Gravitational constant

6.02×10²³ mol^-1 Avogadro Constant

8.31 JK^⁻¹mol^⁻¹ Gas constant

1.38×10^⁻²³ JK^⁻¹ Boltzmann constant

5.67×10^⁻⁸ Wm^⁻²K^⁻⁴ Stefan–Boltzmann constant

8.99×10^⁹ Nm^²C^⁻² Coulomb constant

8.85×10^⁻¹² C^²N^⁻¹m^⁻² Permittivity of free space

4π×10^⁻⁷ TmA^⁻¹ Permeability of free space

3.00×10^⁸ ms^⁻¹ Speed of light in vacuum

6.63×10^⁻³⁴ Js Planck constant

1.60×10^⁻¹⁹ C Elementary charge

9.11×10^⁻³¹ kg Electron rest mass (kg)

0.000549 u Electron rest mass (u)

0.511 MeV c^⁻² Electron rest mass (MeV c⁻²)

1.673×10^⁻²⁷ kg Proton rest mass (kg)

1.007276 u Proton rest mass (u)

938 MeV c^⁻² Proton rest mass (MeV c⁻²)

1.675×10^⁻²⁷ kg Neutron rest mass (kg)

1.008665 u Neutron rest mass (u)

940 MeV c^⁻² Neutron rest mass (MeV c⁻²)

1.661×10^⁻²⁷ kg (Unified) Atomic mass unit

931.5 MeV c^⁻² Atomic mass unit (MeV c⁻²)

1.36×10^³ Wm^⁻² Solar constant

1.20×10^⁻¹⁵ m Fermi radius