Fundamental constants
Data are from http://physics.nist.gov/, 2017
| SI | CGS | |||
| c | 2.99 792 458 | 1e8 m/s | 1e10 cm/s | speed of light in vacuum |
| mu_0 | 12.566 370 614 | 1e-7 N/A^2 | Permeability of vacuum | |
| e_0 | 8.854 187 817 | 1e-12 F/m, or 1/(mu0*c^2) |
permittivity of vacuum | |
| G | 6.674 08 | 1e-11 m^3/(kg*s^2) | Newtonian constant of gravitation | |
| h | 6.626 070 04 | 1e-34 J*s | 1e-27 ergs | Planck constant |
| c | 1.602 176 6208 | 1e-19 C | 1e-20 emu | elementary charge on proton, electron |
| a_0 | 0.529 177 210 67 | 1e-10 m | 1e--8 cm | Bohr radius |
| Eh | 4.359 744 650 | 1e-18 J | Hartree energy | |
| me | 9.109 383 56 | 1e-31 kg | 1e-28 g | mass of the electron |
| mp | 1.672 621 898 | 1e-27 kg | 1e-24 g | mass of the proton |
| mn | 1.674 927 471 | 1e-27 kg | 1e-24 g | mass of the neutron |
| NA | 6.022 140 857 | 1e23 1/mol | 1e23 1/mol | Avogadro constant |
| mu | 1.660 539 040 | 1e-27 kg | 1e-24 g | atomic mass constant |
| R | 8.314 4598 | J/(mol*K) | 1e7 erg/(mol*K) | molar gas constant |
| k | 1.380 648 52 | 1e-23 J/K | 1e-16 erg/K | Boltzmann constant R/NA |