Plank Unit
"Natural units" (particle physics) [edit]
| Unit | Metric value | Derivation |
|---|---|---|
| 1 eV−1 of length | 1.97×10−7 m |  |
| 1 eV of mass | 1.78×10−36 kg |  |
| 1 eV−1 of time | 6.58×10−16 s |  |
| 1 eV of temperature | 1.16×104 K |  |
| 1 unit of electric charge (L–H) | 5.29×10−19 C |  |
| 1 unit of electric charge (G) | 1.88×10−18 C |  |
is the
Like the other systems (see above), the electromagnetism units in Planck units can be based on either Lorentz–Heaviside units or Gaussian units. The unit of charge is different in each.
Finally, one more unit is needed. Most commonly, electron-volt (eV) is used, despite the fact that this is not a "natural" unit in the sense discussed above – it is defined by a natural property, the elementary charge, and the anthropogenic unit of electric potential, the volt. (The SI prefixed multiples of eV are used as well: keV, MeV, GeV, etc.)
With the addition of eV (or any other auxiliary unit), any quantity can be expressed. For example, a distance of 1 cm can be expressed in terms of eV, in natural units, as:[5]
