Deuteron mass in u
Atomic & nuclearMeasured
= 2.013 553 212 544(15) u
- Value
- 2.013 553 212 544 u
- Standard uncertainty
- 1.5 × 10−11 u
- Relative uncertainty
- 7.4 × 10−12 (7.4 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
# deuteron mass in u, CODATA 2022 (NIST)
deuteron_mass_in_u = 2.013553212544 # u, standard uncertainty 1.5e-11
# SciPy: scipy.constants.physical_constants['deuteron mass in u']What it is
The rest mass of the deuteron, the nucleus of deuterium (one proton and one neutron), in unified atomic mass units (daltons), where 1 u is one twelfth of the mass of a carbon-12 atom.
In other units
| Unit | Value | |
|---|---|---|
| CGS (g) | 3.343 583 776 78 × 10−24 | |
| MeV/c² MeV / c² | 1875.612 945 01 | |
| GeV/c² GeV / c² | 1.875 612 945 01 |
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 | 2.013 553 212 544(15) | 7.4 × 10−12 | −5.0 σ of 2018 |
| 2018 | 2.013 553 212 745(40) | 2.0 × 10−11 | +0.0 σ of 2014 |
| 2014 | 2.013 553 212 745(40) | 2.0 × 10−11 | +0.4 σ of 2010 |
| 2010 | 2.013 553 212 712(77) | 3.8 × 10−11 | −0.2 σ of 2006 |
| 2006 | 2.013 553 212 724(78) | 3.9 × 10−11 | +0.1 σ of 2002 |
| 2002 | 2.013 553 212 70(35) | 1.7 × 10−10 | −0.0 σ of 1998 |
| 1998 | 2.013 553 212 71(35) | 1.7 × 10−10 |
“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).