Constants & Units · constant
Proton mass
m_p = 1.672 621 925 95(52) × 10⁻²⁷ kg
- Unit
- kg
- Value
- 1.672 621 925 95(52) × 10⁻²⁷
- Exact
- no
- Note
- Only ~1% of it is the quark masses; the rest is the binding energy of the strong force.
- Symbol
- m_p
- Category
- Atomic & nuclear
- Numeric
- 1.67262192595e-27
- Uncertainty
- ±3.1 × 10⁻¹⁰ relative
Open on the Constants & Units shelf — the interactive card, the filters, and everything alongside it.