Deuteron mass
Atomic & nuclearMeasured
= 3.343 583 7768(10) × 10−27 kg
- Value
- 3.343 583 7768 × 10−27 kg
- Standard uncertainty
- 1 × 10−36 kg
- Relative uncertainty
- 3.0 × 10−10 (299 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
# deuteron mass, CODATA 2022 (NIST)
deuteron_mass = 3.3435837768e-27 # kg, standard uncertainty 1e-36
# SciPy: scipy.constants.physical_constants['deuteron mass']What it is
The rest mass of the deuteron, the nucleus of deuterium (one proton and one neutron), in kilograms.
In other units
| Unit | Value | |
|---|---|---|
| CGS (g) | 3.343 583 7768 × 10−24 | |
| u dalton / atomic mass unit | 2.013 553 213 | unit is itself measured |
| MeV/c² MeV / c² | 1875.612 945 | |
| GeV/c² GeV / c² | 1.875 612 945 |
Converted with ConstantID's unit table; digits are rounded to the precision of the value, and a long exact value is rounded only for display. The relative uncertainty is unchanged by conversion to an exactly defined unit.
How the value changed, 1998–2022
Each point is one CODATA adjustment, plotted as its difference from the 2022 value; the bars show one standard uncertainty (an arrowhead means the bar runs off the chart).
Relative uncertainty
| CODATA | Value (uncertainty) | Relative uncertainty | Change from previous |
|---|---|---|---|
| 2022 | 3.343 583 7768(10) × 10−27 | 3.0 × 10−10 | +4.4 σ of 2018 |
| 2018 | 3.343 583 7724(10) × 10−27 | 3.0 × 10−10 | +1.3 σ of 2014 |
| 2014 | 3.343 583 719(41) × 10−27 | 1.2 × 10−8 | +1.6 σ of 2010 |
| 2010 | 3.343 583 48(15) × 10−27 | 4.5 × 10−8 | +1.6 σ of 2006 |
| 2006 | 3.343 583 20(17) × 10−27 | 5.1 × 10−8 | −0.3 σ of 2002 |
| 2002 | 3.343 583 35(57) × 10−27 | 1.7 × 10−7 | +1.0 σ of 1998 |
| 1998 | 3.343 583 09(26) × 10−27 | 7.8 × 10−8 |
“Change from previous” is the shift in the value divided by the standard uncertainty of the previous adjustment. Earlier values are converted into the current unit where NIST changed it (for example J s to J Hz⁻¹).