| Quantity | Unit | Conversion |
| Magnetic field strength | Gauss (G) | 1 G = 10-4 T |
| Energy | erg | 1 erg = 10-7 J |
| Length | Angstrom (Å) | 1 Å = 10-10 m |
| Particle energy | electron volt (eV) | 1 eV = 1.60 ×10-19 J |
| Particle mass | electron volt (eV) | 1 eV = 1.78 ×10-36 kg |
| Quantity | Symbol | Value |
| speed of light | c | 3.00 ×108 m s-1 |
| permeability of free space | m0 | 4 p×10-7 H m-1 |
| dielectric constant | e0 | 8.85 ×10-12 F m-1 |
| electron charge | e | 1.60 ×10-19 C |
| electron mass | me | 9.11 ×10-31 kg |
| electron mass | me | 5.12 ×105 eV |
| proton mass | mp | 1.67 ×10-27 kg |
| proton mass | mp | 9.38 ×108 eV |
| Boltzmann's constant | kB | 1.38 ×10-23 J K-1 |
| Astronomical Unit | AU | 1.50 ×1011 m |
| Earth's radius | RE | 6.37 ×106 m |