MeV/c
megaelectron volt per c
Momentumexact by definition
The megaelectronvolt per c is the particle physicist's momentum unit, about 5.344286 × 10⁻²² kilogram metres per second. It comes from the relativistic relation E² = (pc)² + (mc²)², which makes momentum times c an energy, so quoting momentum in energy units and dividing by c is the natural bookkeeping.
Watch out: The unit is exact because both the electronvolt and the speed of light are exact in the current SI. Detector papers frequently drop the c entirely and write momenta in MeV, relying on the reader to know that natural units set c = 1.
| 1 MeV/c | 5.3442860e-22 kg·m/s |
Solvers that use momentum